diff --git a/modules/audio_processing/main/source/echo_cancellation_impl.cc b/modules/audio_processing/main/source/echo_cancellation_impl.cc
index ee4b97dd76..886d5f158c 100644
--- a/modules/audio_processing/main/source/echo_cancellation_impl.cc
+++ b/modules/audio_processing/main/source/echo_cancellation_impl.cc
@@ -24,6 +24,19 @@ namespace webrtc {
 typedef void Handle;
 
 namespace {
+WebRtc_Word16 MapSetting(EchoCancellation::SuppressionLevel level) {
+  switch (level) {
+    case EchoCancellation::kLowSuppression:
+      return kAecNlpConservative;
+    case EchoCancellation::kModerateSuppression:
+      return kAecNlpModerate;
+    case EchoCancellation::kHighSuppression:
+      return kAecNlpAggressive;
+    default:
+      return -1;
+  }
+}
+
 int MapError(int err) {
   switch (err) {
     case AEC_UNSUPPORTED_FUNCTION_ERROR:
@@ -164,9 +177,7 @@ bool EchoCancellationImpl::is_enabled() const {
 
 int EchoCancellationImpl::set_suppression_level(SuppressionLevel level) {
   CriticalSectionScoped crit_scoped(*apm_->crit());
-  if (level != kLowSuppression &&
-      level != kModerateSuppression &&
-      level != kHighSuppression) {
+  if (MapSetting(level) == -1) {
     return apm_->kBadParameterError;
   }
 
@@ -315,27 +326,11 @@ int EchoCancellationImpl::InitializeHandle(void* handle) const {
                        device_sample_rate_hz_);
 }
 
-/*int EchoCancellationImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = WebRtcAec_Init(static_cast<Handle*>(handles[i]),
-                        apm_->SampleRateHz(),
-                        device_sample_rate_hz_);
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int EchoCancellationImpl::ConfigureHandle(void* handle) const {
   assert(handle != NULL);
   AecConfig config;
   config.metricsMode = metrics_enabled_;
-  config.nlpMode = suppression_level_;
+  config.nlpMode = MapSetting(suppression_level_);
   config.skewMode = drift_compensation_enabled_;
 
   return WebRtcAec_set_config(static_cast<Handle*>(handle), config);
@@ -351,43 +346,3 @@ int EchoCancellationImpl::GetHandleError(void* handle) const {
   return MapError(WebRtcAec_get_error_code(static_cast<Handle*>(handle)));
 }
 }  // namespace webrtc
-
-/*int EchoCancellationImpl::GetConfiguration(void* handle) {
-  if (!initialized_) {
-    return apm_->kNoError;
-  }
-
-  AecConfig config;
-  int err = WebRtcAec_get_config(handle, &config);
-  if (err != apm_->kNoError) {
-    return TranslateError(err);
-  }
-
-  if (config.metricsMode == 0) {
-    metrics_enabled_ = false;
-  } else if (config.metricsMode == 1) {
-    metrics_enabled_ = true;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  if (config.nlpMode == kAecNlpConservative) {
-    suppression_level_ = kLowSuppression;
-  } else if (config.nlpMode == kAecNlpModerate) {
-    suppression_level_ = kModerateSuppression;
-  } else if (config.nlpMode == kAecNlpAggressive) {
-    suppression_level_ = kHighSuppression;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  if (config.skewMode == 0) {
-    drift_compensation_enabled_ = false;
-  } else if (config.skewMode == 1) {
-    drift_compensation_enabled_ = true;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  return apm_->kNoError;
-}*/
diff --git a/modules/audio_processing/main/source/echo_cancellation_impl.h b/modules/audio_processing/main/source/echo_cancellation_impl.h
index 065c82b173..380a69849f 100644
--- a/modules/audio_processing/main/source/echo_cancellation_impl.h
+++ b/modules/audio_processing/main/source/echo_cancellation_impl.h
@@ -53,12 +53,9 @@ class EchoCancellationImpl : public EchoCancellation,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-
   virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
diff --git a/modules/audio_processing/main/source/echo_control_mobile_impl.cc b/modules/audio_processing/main/source/echo_control_mobile_impl.cc
index 2c5c12a11b..1cd2502e2f 100644
--- a/modules/audio_processing/main/source/echo_control_mobile_impl.cc
+++ b/modules/audio_processing/main/source/echo_control_mobile_impl.cc
@@ -22,6 +22,41 @@ namespace webrtc {
 
 typedef void Handle;
 
+namespace {
+WebRtc_Word16 MapSetting(EchoControlMobile::RoutingMode mode) {
+  switch (mode) {
+    case EchoControlMobile::kQuietEarpieceOrHeadset:
+      return 0;
+    case EchoControlMobile::kEarpiece:
+      return 1;
+    case EchoControlMobile::kLoudEarpiece:
+      return 2;
+    case EchoControlMobile::kSpeakerphone:
+      return 3;
+    case EchoControlMobile::kLoudSpeakerphone:
+      return 4;
+    default:
+      return -1;
+  }
+}
+
+int MapError(int err) {
+  switch (err) {
+    case AECM_UNSUPPORTED_FUNCTION_ERROR:
+      return AudioProcessing::kUnsupportedFunctionError;
+    case AECM_BAD_PARAMETER_ERROR:
+      return AudioProcessing::kBadParameterError;
+    case AECM_BAD_PARAMETER_WARNING:
+      return AudioProcessing::kBadStreamParameterWarning;
+    default:
+      // AECMOBFIX_UNSPECIFIED_ERROR
+      // AECMOBFIX_UNINITIALIZED_ERROR
+      // AECMOBFIX_NULL_POINTER_ERROR
+      return AudioProcessing::kUnspecifiedError;
+  }
+}
+}  // namespace
+
 EchoControlMobileImpl::EchoControlMobileImpl(const AudioProcessingImpl* apm)
   : ProcessingComponent(apm),
     apm_(apm),
@@ -44,13 +79,14 @@ int EchoControlMobileImpl::ProcessRenderAudio(const AudioBuffer* audio) {
   size_t handle_index = 0;
   for (int i = 0; i < apm_->num_output_channels(); i++) {
     for (int j = 0; j < audio->num_channels(); j++) {
+      Handle* my_handle = static_cast<Handle*>(handle(handle_index));
       err = WebRtcAecm_BufferFarend(
-          static_cast<Handle*>(handle(handle_index)),
+          my_handle,
           audio->low_pass_split_data(j),
           static_cast<WebRtc_Word16>(audio->samples_per_split_channel()));
 
       if (err != apm_->kNoError) {
-        return TranslateError(err);  // TODO(ajm): warning possible?
+        return GetHandleError(my_handle);  // TODO(ajm): warning possible?
       }
 
       handle_index++;
@@ -86,8 +122,9 @@ int EchoControlMobileImpl::ProcessCaptureAudio(AudioBuffer* audio) {
       clean = NULL;
     }
     for (int j = 0; j < apm_->num_reverse_channels(); j++) {
+      Handle* my_handle = static_cast<Handle*>(handle(handle_index));
       err = WebRtcAecm_Process(
-          static_cast<Handle*>(handle(handle_index)),
+          my_handle,
           noisy,
           clean,
           audio->low_pass_split_data(i),
@@ -95,7 +132,7 @@ int EchoControlMobileImpl::ProcessCaptureAudio(AudioBuffer* audio) {
           apm_->stream_delay_ms());
 
       if (err != apm_->kNoError) {
-        return TranslateError(err);  // TODO(ajm): warning possible?
+        return GetHandleError(my_handle);  // TODO(ajm): warning possible?
       }
 
       handle_index++;
@@ -121,11 +158,7 @@ bool EchoControlMobileImpl::is_enabled() const {
 
 int EchoControlMobileImpl::set_routing_mode(RoutingMode mode) {
   CriticalSectionScoped crit_scoped(*apm_->crit());
-  if (mode != kQuietEarpieceOrHeadset &&
-      mode != kEarpiece &&
-      mode != kLoudEarpiece &&
-      mode != kSpeakerphone &&
-      mode != kLoudSpeakerphone) {
+  if (MapSetting(mode) == -1) {
     return apm_->kBadParameterError;
   }
 
@@ -192,26 +225,10 @@ int EchoControlMobileImpl::InitializeHandle(void* handle) const {
                                  // required by AECM.
 }
 
-/*int EchoControlMobileImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = WebRtcAec_Init(static_cast<Handle*>(handles[i]),
-                        apm_->SampleRateHz(),
-                        device_sample_rate_hz_);
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int EchoControlMobileImpl::ConfigureHandle(void* handle) const {
   AecmConfig config;
   config.cngMode = comfort_noise_enabled_;
-  config.echoMode = routing_mode_;
+  config.echoMode = MapSetting(routing_mode_);
 
   return WebRtcAecm_set_config(static_cast<Handle*>(handle), config);
 }
@@ -221,58 +238,8 @@ int EchoControlMobileImpl::num_handles_required() const {
          apm_->num_reverse_channels();
 }
 
-int EchoControlMobileImpl::TranslateError(int err) const {
-  if (err == AECM_UNSUPPORTED_FUNCTION_ERROR) {
-    return apm_->kUnsupportedFunctionError;
-  } else if (err == AECM_BAD_PARAMETER_ERROR) {
-    return apm_->kBadParameterError;
-  } else if (err == AECM_BAD_PARAMETER_WARNING) {
-    return apm_->kBadStreamParameterWarning;
-  } else {
-    // AECMOBFIX_UNSPECIFIED_ERROR
-    // AECMOBFIX_UNINITIALIZED_ERROR
-    // AECMOBFIX_NULL_POINTER_ERROR
-    return apm_->kUnspecifiedError;
-  }
+int EchoControlMobileImpl::GetHandleError(void* handle) const {
+  assert(handle != NULL);
+  return MapError(WebRtcAecm_get_error_code(static_cast<Handle*>(handle)));
 }
 }  // namespace webrtc
-
-/*int EchoControlMobileImpl::GetConfiguration(void* handle) {
-  if (!initialized_) {
-    return apm_->kNoError;
-  }
-
-  AecConfig config;
-  int err = WebRtcAec_get_config(handle, &config);
-  if (err != apm_->kNoError) {
-    return TranslateError(err);
-  }
-
-  if (config.metricsMode == 0) {
-    metrics_enabled_ = false;
-  } else if (config.metricsMode == 1) {
-    metrics_enabled_ = true;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  if (config.nlpMode == kAecNlpConservative) {
-    routing_mode_ = kLowSuppression;
-  } else if (config.nlpMode == kAecNlpModerate) {
-    routing_mode_ = kMediumSuppression;
-  } else if (config.nlpMode == kAecNlpAggressive) {
-    routing_mode_ = kHighSuppression;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  if (config.skewMode == 0) {
-    drift_compensation_enabled_ = false;
-  } else if (config.skewMode == 1) {
-    drift_compensation_enabled_ = true;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  return apm_->kNoError;
-}*/
diff --git a/modules/audio_processing/main/source/echo_control_mobile_impl.h b/modules/audio_processing/main/source/echo_control_mobile_impl.h
index f9445917a2..2fd624810a 100644
--- a/modules/audio_processing/main/source/echo_control_mobile_impl.h
+++ b/modules/audio_processing/main/source/echo_control_mobile_impl.h
@@ -45,12 +45,10 @@ class EchoControlMobileImpl : public EchoControlMobile,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  virtual int TranslateError(int err) const;
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
   RoutingMode routing_mode_;
diff --git a/modules/audio_processing/main/source/gain_control_impl.cc b/modules/audio_processing/main/source/gain_control_impl.cc
index 173e98aaa9..dc3e565589 100644
--- a/modules/audio_processing/main/source/gain_control_impl.cc
+++ b/modules/audio_processing/main/source/gain_control_impl.cc
@@ -48,7 +48,6 @@ WebRtc_Word16 MapSetting(GainControl::Mode mode) {
       return kAgcModeFixedDigital;
       break;
     default:
-      assert(false);
       return -1;
   }
 }
@@ -83,13 +82,14 @@ int GainControlImpl::ProcessRenderAudio(AudioBuffer* audio) {
   }
 
   for (int i = 0; i < num_handles(); i++) {
+    Handle* my_handle = static_cast<Handle*>(handle(i));
     int err = WebRtcAgc_AddFarend(
-        static_cast<Handle*>(handle(i)),
+        my_handle,
         mixed_data,
         static_cast<WebRtc_Word16>(audio->samples_per_split_channel()));
 
     if (err != apm_->kNoError) {
-      return TranslateError(err);
+      return GetHandleError(my_handle);
     }
   }
 
@@ -108,32 +108,36 @@ int GainControlImpl::AnalyzeCaptureAudio(AudioBuffer* audio) {
 
   if (mode_ == kAdaptiveAnalog) {
     for (int i = 0; i < num_handles(); i++) {
+      Handle* my_handle = static_cast<Handle*>(handle(i));
       err = WebRtcAgc_AddMic(
-          static_cast<Handle*>(handle(i)),
+          my_handle,
           audio->low_pass_split_data(i),
           audio->high_pass_split_data(i),
           static_cast<WebRtc_Word16>(audio->samples_per_split_channel()));
 
       if (err != apm_->kNoError) {
-        return TranslateError(err);
+        return GetHandleError(my_handle);
       }
     }
   } else if (mode_ == kAdaptiveDigital) {
 
     for (int i = 0; i < num_handles(); i++) {
+      Handle* my_handle = static_cast<Handle*>(handle(i));
       WebRtc_Word32 capture_level_out = 0;
+
       err = WebRtcAgc_VirtualMic(
-          static_cast<Handle*>(handle(i)),
+          my_handle,
           audio->low_pass_split_data(i),
           audio->high_pass_split_data(i),
           static_cast<WebRtc_Word16>(audio->samples_per_split_channel()),
           //capture_levels_[i],
           analog_capture_level_,
           &capture_level_out);
+
       capture_levels_[i] = capture_level_out;
 
       if (err != apm_->kNoError) {
-        return TranslateError(err);
+        return GetHandleError(my_handle);
       }
 
     }
@@ -156,11 +160,12 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
 
   stream_is_saturated_ = false;
   for (int i = 0; i < num_handles(); i++) {
+    Handle* my_handle = static_cast<Handle*>(handle(i));
     WebRtc_Word32 capture_level_out = 0;
     WebRtc_UWord8 saturation_warning = 0;
 
     int err = WebRtcAgc_Process(
-        static_cast<Handle*>(handle(i)),
+        my_handle,
         audio->low_pass_split_data(i),
         audio->high_pass_split_data(i),
         static_cast<WebRtc_Word16>(audio->samples_per_split_channel()),
@@ -172,7 +177,7 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
         &saturation_warning);
 
     if (err != apm_->kNoError) {
-      return TranslateError(err);
+      return GetHandleError(my_handle);
     }
 
     capture_levels_[i] = capture_level_out;
@@ -231,9 +236,7 @@ bool GainControlImpl::is_enabled() const {
 
 int GainControlImpl::set_mode(Mode mode) {
   CriticalSectionScoped crit_scoped(*apm_->crit());
-  if (mode != kAdaptiveAnalog &&
-      mode != kAdaptiveDigital &&
-      mode != kFixedDigital) {
+  if (MapSetting(mode) == -1) {
     return apm_->kBadParameterError;
   }
 
@@ -361,33 +364,6 @@ int GainControlImpl::InitializeHandle(void* handle) const {
                           apm_->sample_rate_hz());
 }
 
-/*int GainControlImpl::InitializeHandles(const vector<void*>& handles)
-    const {
-  int err = apm_->kNoError;
-
-  err = WebRtcAgc_Init(static_cast<Handle*>(handles[0]),
-                         minimum_capture_level_,
-                         maximum_capture_level_,
-                         mode_,
-                         apm_->SampleRateHz());
-  if (err != apm_->kNoError) {
-    return TranslateError(err);
-  }
-
-  for (size_t i = 1; i < num_handles(); i++) {
-    WebRtcAgc_Init(static_cast<Handle*>(handles[i]),
-                     minimum_capture_level_,
-                     maximum_capture_level_,
-                     kFixedDigital,
-                     apm_->SampleRateHz());
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int GainControlImpl::ConfigureHandle(void* handle) const {
   WebRtcAgc_config_t config;
   // TODO(ajm): Flip the sign here (since AGC expects a positive value) if we
@@ -406,40 +382,10 @@ int GainControlImpl::num_handles_required() const {
   return apm_->num_output_channels();
 }
 
-/*int GainControlImpl::GetConfiguration() {
-  if (!initialized_) {
-    return apm_->kNoError;
-  }
-
-  WebRtcAgc_config_t config;
-  int err = WebRtcAgc_get_config(handle_, &config);
-  if (err != apm_->kNoError) {
-    return TranslateError(err);
-  }
-
-  if (config.targetLevelDbfs < 0) {
-    return apm_->kUnspecifiedError;
-  }
-  target_level_dbfs_ = config.targetLevelDbfs;
-
-  if (config.compressionGaindB < 0) {
-    return apm_->kUnspecifiedError;
-  }
-  compression_gain_db_ = config.compressionGaindB;
-
-  if (config.limiterEnable == 0) {
-    limiter_enabled_ = false;
-  } else if (config.limiterEnable == 1) {
-    limiter_enabled_ = true;
-  } else {
-    return apm_->kUnspecifiedError;
-  }
-
-  return apm_->kNoError;
-}*/
-
-// TODO(ajm): implement
-int GainControlImpl::TranslateError(int /*err*/) const {
-  return -1;
+int GainControlImpl::GetHandleError(void* handle) const {
+  // The AGC has no get_error() function.
+  // (Despite listing errors in its interface...)
+  assert(handle != NULL);
+  return apm_->kUnspecifiedError;
 }
 }  // namespace webrtc
diff --git a/modules/audio_processing/main/source/gain_control_impl.h b/modules/audio_processing/main/source/gain_control_impl.h
index 3022cc5028..a11d606f45 100644
--- a/modules/audio_processing/main/source/gain_control_impl.h
+++ b/modules/audio_processing/main/source/gain_control_impl.h
@@ -58,12 +58,10 @@ class GainControlImpl : public GainControl,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  virtual int TranslateError(int err) const;
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
   Mode mode_;
diff --git a/modules/audio_processing/main/source/high_pass_filter_impl.cc b/modules/audio_processing/main/source/high_pass_filter_impl.cc
index fba3c71d12..fa6d5d5ece 100644
--- a/modules/audio_processing/main/source/high_pass_filter_impl.cc
+++ b/modules/audio_processing/main/source/high_pass_filter_impl.cc
@@ -21,7 +21,6 @@
 
 namespace webrtc {
 namespace {
-
 const WebRtc_Word16 kFilterCoefficients8kHz[5] =
     {3798, -7596, 3798, 7807, -3733};
 
@@ -92,8 +91,8 @@ int Filter(FilterState* hpf, WebRtc_Word16* data, int length) {
 
     // Saturate (to 2^27) so that the HP filtered signal does not overflow
     tmp_int32 = WEBRTC_SPL_SAT(static_cast<WebRtc_Word32>(134217727),
-                                  tmp_int32,
-                                  static_cast<WebRtc_Word32>(-134217728));
+                               tmp_int32,
+                               static_cast<WebRtc_Word32>(-134217728));
 
     // Convert back to Q0 and use rounding
     data[i] = (WebRtc_Word16)WEBRTC_SPL_RSHIFT_W32(tmp_int32, 12);
@@ -122,13 +121,13 @@ int HighPassFilterImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   assert(audio->samples_per_split_channel() <= 160);
 
   for (int i = 0; i < num_handles(); i++) {
-    err = Filter(static_cast<Handle*>(handle(i)),
+    Handle* my_handle = static_cast<Handle*>(handle(i));
+    err = Filter(my_handle,
                  audio->low_pass_split_data(i),
                  audio->samples_per_split_channel());
 
     if (err != apm_->kNoError) {
-      //return TranslateError(err);
-      return err;
+      return GetHandleError(my_handle);
     }
   }
 
@@ -165,21 +164,6 @@ int HighPassFilterImpl::InitializeHandle(void* handle) const {
                           apm_->sample_rate_hz());
 }
 
-/*int HighPassFilterImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = InitializeFilter(static_cast<Handle*>(handles[i]),
-                           apm_->SampleRateHz());
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int HighPassFilterImpl::ConfigureHandle(void* /*handle*/) const {
   return apm_->kNoError; // Not configurable.
 }
@@ -188,8 +172,9 @@ int HighPassFilterImpl::num_handles_required() const {
   return apm_->num_output_channels();
 }
 
-// TODO(ajm): implement
-int HighPassFilterImpl::TranslateError(int /*err*/) const {
-  return -1;
+int HighPassFilterImpl::GetHandleError(void* handle) const {
+  // The component has no detailed errors.
+  assert(handle != NULL);
+  return apm_->kUnspecifiedError;
 }
 }  // namespace webrtc
diff --git a/modules/audio_processing/main/source/high_pass_filter_impl.h b/modules/audio_processing/main/source/high_pass_filter_impl.h
index 474772f4a4..4c23754270 100644
--- a/modules/audio_processing/main/source/high_pass_filter_impl.h
+++ b/modules/audio_processing/main/source/high_pass_filter_impl.h
@@ -39,13 +39,10 @@ class HighPassFilterImpl : public HighPassFilter,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  virtual int TranslateError(int err) const;
-  //virtual int GetConfiguration();
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
 };
diff --git a/modules/audio_processing/main/source/level_estimator_impl.cc b/modules/audio_processing/main/source/level_estimator_impl.cc
index 05db3a2bd4..799a9624f7 100644
--- a/modules/audio_processing/main/source/level_estimator_impl.cc
+++ b/modules/audio_processing/main/source/level_estimator_impl.cc
@@ -25,7 +25,6 @@ namespace webrtc {
 typedef void Handle;
 
 namespace {
-
 /*int EstimateLevel(AudioBuffer* audio, Handle* my_handle) {
   assert(audio->samples_per_split_channel() <= 160);
 
@@ -39,7 +38,7 @@ namespace {
                          mixed_data,
                          audio->samples_per_split_channel());
   if (err != AudioProcessing::kNoError) {
-    return TranslateError(err);
+    return GetHandleError(my_handle);
   }
 
   return AudioProcessing::kNoError;
@@ -165,20 +164,6 @@ int LevelEstimatorImpl::InitializeHandle(void* /*handle*/) const {
                     kIntervalSeconds);*/
 }
 
-/*int LevelEstimatorImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = InitLvlEst(static_cast<Handle*>(handles[i]), apm_->SampleRateHz());
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int LevelEstimatorImpl::ConfigureHandle(void* /*handle*/) const {
   return apm_->kUnsupportedComponentError;
   //return apm_->kNoError;
@@ -189,9 +174,9 @@ int LevelEstimatorImpl::num_handles_required() const {
   //return 2;
 }
 
-//int LevelEstimatorImpl::GetConfiguration() {
-//  // There are no configuration accessors.
-//  return apm_->kUnsupportedFunctionError;
-//}
-
+int LevelEstimatorImpl::GetHandleError(void* handle) const {
+  // The component has no detailed errors.
+  assert(handle != NULL);
+  return apm_->kUnspecifiedError;
+}
 }  // namespace webrtc
diff --git a/modules/audio_processing/main/source/level_estimator_impl.h b/modules/audio_processing/main/source/level_estimator_impl.h
index d097bde233..1515722df4 100644
--- a/modules/audio_processing/main/source/level_estimator_impl.h
+++ b/modules/audio_processing/main/source/level_estimator_impl.h
@@ -41,12 +41,10 @@ class LevelEstimatorImpl : public LevelEstimator,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  //virtual int TranslateError(int err) const;
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
 };
diff --git a/modules/audio_processing/main/source/noise_suppression_impl.cc b/modules/audio_processing/main/source/noise_suppression_impl.cc
index 080ce117e1..f899f350ca 100644
--- a/modules/audio_processing/main/source/noise_suppression_impl.cc
+++ b/modules/audio_processing/main/source/noise_suppression_impl.cc
@@ -30,6 +30,23 @@ typedef NsHandle Handle;
 typedef NsxHandle Handle;
 #endif
 
+namespace {
+int MapSetting(NoiseSuppression::Level level) {
+  switch (level) {
+    case NoiseSuppression::kLow:
+      return 0;
+    case NoiseSuppression::kModerate:
+      return 1;
+    case NoiseSuppression::kHigh:
+      return 2;
+    case NoiseSuppression::kVeryHigh:
+      return 3;
+    default:
+      return -1;
+  }
+}
+}  // namespace
+
 NoiseSuppressionImpl::NoiseSuppressionImpl(const AudioProcessingImpl* apm)
   : ProcessingComponent(apm),
     apm_(apm),
@@ -47,6 +64,7 @@ int NoiseSuppressionImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   assert(audio->num_channels() == num_handles());
 
   for (int i = 0; i < num_handles(); i++) {
+    Handle* my_handle = static_cast<Handle*>(handle(i));
 #if defined(WEBRTC_NS_FLOAT)
     err = WebRtcNs_Process(static_cast<Handle*>(handle(i)),
                            audio->low_pass_split_data(i),
@@ -62,7 +80,7 @@ int NoiseSuppressionImpl::ProcessCaptureAudio(AudioBuffer* audio) {
 #endif
 
     if (err != apm_->kNoError) {
-      return TranslateError(err);
+      return GetHandleError(my_handle);
     }
   }
 
@@ -80,10 +98,7 @@ bool NoiseSuppressionImpl::is_enabled() const {
 
 int NoiseSuppressionImpl::set_level(Level level) {
   CriticalSectionScoped crit_scoped(*apm_->crit());
-  if (level != kLow &&
-      level != kModerate &&
-      level != kHigh &&
-      level != kVeryHigh) {
+  if (MapSetting(level) == -1) {
     return apm_->kBadParameterError;
   }
 
@@ -141,25 +156,13 @@ int NoiseSuppressionImpl::InitializeHandle(void* handle) const {
 #endif
 }
 
-/*int NoiseSuppressionImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = WebRtcNs_Init(static_cast<Handle*>(handles[i]), apm_->SampleRateHz());
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int NoiseSuppressionImpl::ConfigureHandle(void* handle) const {
 #if defined(WEBRTC_NS_FLOAT)
-  return WebRtcNs_set_policy(static_cast<Handle*>(handle), level_);
+  return WebRtcNs_set_policy(static_cast<Handle*>(handle),
+                             MapSetting(level_));
 #elif defined(WEBRTC_NS_FIXED)
-  return WebRtcNsx_set_policy(static_cast<Handle*>(handle), level_);
+  return WebRtcNsx_set_policy(static_cast<Handle*>(handle),
+                              MapSetting(level_));
 #endif
 }
 
@@ -167,14 +170,10 @@ int NoiseSuppressionImpl::num_handles_required() const {
   return apm_->num_output_channels();
 }
 
-//int NoiseSuppressionImpl::GetConfiguration() {
-//  // There are no configuration accessors.
-//  return apm_->kUnsupportedFunctionError;
-//}
-
-// TODO(ajm): implement
-int NoiseSuppressionImpl::TranslateError(int /*err*/) const {
-  return -1;
+int NoiseSuppressionImpl::GetHandleError(void* handle) const {
+  // The NS has no get_error() function.
+  assert(handle != NULL);
+  return apm_->kUnspecifiedError;
 }
 }  // namespace webrtc
 
diff --git a/modules/audio_processing/main/source/noise_suppression_impl.h b/modules/audio_processing/main/source/noise_suppression_impl.h
index 15f25170f5..c9ff9b31af 100644
--- a/modules/audio_processing/main/source/noise_suppression_impl.h
+++ b/modules/audio_processing/main/source/noise_suppression_impl.h
@@ -41,12 +41,10 @@ class NoiseSuppressionImpl : public NoiseSuppression,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  virtual int TranslateError(int err) const;
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
   Level level_;
diff --git a/modules/audio_processing/main/source/processing_component.cc b/modules/audio_processing/main/source/processing_component.cc
index d7a7a0ffc2..9ac125794c 100644
--- a/modules/audio_processing/main/source/processing_component.cc
+++ b/modules/audio_processing/main/source/processing_component.cc
@@ -86,13 +86,9 @@ int ProcessingComponent::Initialize() {
 
     int err = InitializeHandle(handles_[i]);
     if (err != apm_->kNoError) {
-      return err;
+      return GetHandleError(handles_[i]);
     }
   }
-  //int err = InitializeHandles(handles_);
-  //if (err != apm_->kNoError) {
-  //  return TranslateError(err);
-  //}
 
   initialized_ = true;
   return Configure();
@@ -107,9 +103,7 @@ int ProcessingComponent::Configure() {
   for (int i = 0; i < num_handles_; i++) {
     int err = ConfigureHandle(handles_[i]);
     if (err != apm_->kNoError) {
-      // Try to get the current valid state.
-      //GetConfiguration();
-      return err;
+      return GetHandleError(handles_[i]);
     }
   }
 
diff --git a/modules/audio_processing/main/source/processing_component.h b/modules/audio_processing/main/source/processing_component.h
index 64319c65a7..3d8a02bd3e 100644
--- a/modules/audio_processing/main/source/processing_component.h
+++ b/modules/audio_processing/main/source/processing_component.h
@@ -44,18 +44,13 @@ class ProcessingComponent {
   void* handle(int index) const;
   int num_handles() const;
 
-  // TODO(ajm): do we want this?
-  //virtual int GetConfiguration() = 0;
-
  private:
   virtual void* CreateHandle() const = 0;
   virtual int InitializeHandle(void* handle) const = 0;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const = 0;
   virtual int ConfigureHandle(void* handle) const = 0;
   virtual int DestroyHandle(void* handle) const = 0;
   virtual int num_handles_required() const = 0;
-  //virtual int TranslateError(int err) const = 0;
+  virtual int GetHandleError(void* handle) const = 0;
 
   const AudioProcessingImpl* apm_;
   std::vector<void*> handles_;
diff --git a/modules/audio_processing/main/source/voice_detection_impl.cc b/modules/audio_processing/main/source/voice_detection_impl.cc
index 8a9d984b3d..3eb446e911 100644
--- a/modules/audio_processing/main/source/voice_detection_impl.cc
+++ b/modules/audio_processing/main/source/voice_detection_impl.cc
@@ -38,7 +38,6 @@ WebRtc_Word16 MapSetting(VoiceDetection::Likelihood likelihood) {
       return 0;
       break;
     default:
-      assert(false);
       return -1;
   }
 }
@@ -115,10 +114,7 @@ bool VoiceDetectionImpl::stream_has_voice() const {
 
 int VoiceDetectionImpl::set_likelihood(VoiceDetection::Likelihood likelihood) {
   CriticalSectionScoped crit_scoped(*apm_->crit());
-  if (likelihood != kVeryLowLikelihood &&
-      likelihood != kLowLikelihood &&
-      likelihood != kModerateLikelihood &&
-      likelihood != kHighLikelihood) {
+  if (MapSetting(likelihood) == -1) {
     return apm_->kBadParameterError;
   }
 
@@ -189,37 +185,18 @@ int VoiceDetectionImpl::InitializeHandle(void* handle) const {
   return WebRtcVad_Init(static_cast<Handle*>(handle));
 }
 
-/*int VoiceDetectionImpl::InitializeHandles(
-    const vector<void*>& handles) const {
-  int err = apm_->kNoError;
-
-  for (size_t i = 0; i < num_handles(); i++) {
-    err = WebRtcVad_Init(static_cast<Handle*>(handles[i]),
-                         apm_->SampleRateHz());
-    if (err != apm_->kNoError) {
-      return TranslateError(err);
-    }
-  }
-
-  return apm_->kNoError;
-}*/
-
 int VoiceDetectionImpl::ConfigureHandle(void* handle) const {
   return WebRtcVad_set_mode(static_cast<Handle*>(handle),
-                             MapSetting(likelihood_));
+                            MapSetting(likelihood_));
 }
 
 int VoiceDetectionImpl::num_handles_required() const {
   return 1;
 }
 
-//int VoiceDetectionImpl::GetConfiguration() {
-//  // There are no configuration accessors.
-//  return apm_->kUnsupportedFunctionError;
-//}
-
-// TODO(ajm): implement
-int VoiceDetectionImpl::TranslateError(int /*err*/) const {
-  return -1;
+int VoiceDetectionImpl::GetHandleError(void* handle) const {
+  // The VAD has no get_error() function.
+  assert(handle != NULL);
+  return apm_->kUnspecifiedError;
 }
 }  // namespace webrtc
diff --git a/modules/audio_processing/main/source/voice_detection_impl.h b/modules/audio_processing/main/source/voice_detection_impl.h
index 9f619b222e..ef212d11b9 100644
--- a/modules/audio_processing/main/source/voice_detection_impl.h
+++ b/modules/audio_processing/main/source/voice_detection_impl.h
@@ -46,12 +46,10 @@ class VoiceDetectionImpl : public VoiceDetection,
   // ProcessingComponent implementation.
   virtual void* CreateHandle() const;
   virtual int InitializeHandle(void* handle) const;
-  //virtual int InitializeHandles(
-  //    const std::vector<void*>& handles) const;
   virtual int ConfigureHandle(void* handle) const;
   virtual int DestroyHandle(void* handle) const;
   virtual int num_handles_required() const;
-  virtual int TranslateError(int err) const;
+  virtual int GetHandleError(void* handle) const;
 
   const AudioProcessingImpl* apm_;
   bool stream_has_voice_;
diff --git a/modules/audio_processing/main/test/unit_test/unit_test.cc b/modules/audio_processing/main/test/unit_test/unit_test.cc
index ea6531a45d..1a329ab441 100644
--- a/modules/audio_processing/main/test/unit_test/unit_test.cc
+++ b/modules/audio_processing/main/test/unit_test/unit_test.cc
@@ -146,22 +146,22 @@ void ApmTest::TearDown() {
     delete frame_;
   }
   frame_ = NULL;
-  
+
   if (reverse_frame_) {
     delete reverse_frame_;
   }
   reverse_frame_ = NULL;
-  
+
   if (far_file_) {
     ASSERT_EQ(0, fclose(far_file_));
   }
   far_file_ = NULL;
-  
+
   if (near_file_) {
     ASSERT_EQ(0, fclose(near_file_));
   }
   near_file_ = NULL;
-  
+
   if (stat_file_) {
     ASSERT_EQ(0, fclose(stat_file_));
   }
@@ -748,6 +748,14 @@ TEST_F(ApmTest, EchoControlMobile) {
   // Turn AECM on (and AEC off)
   EXPECT_EQ(apm_->kNoError, apm_->echo_control_mobile()->Enable(true));
   EXPECT_TRUE(apm_->echo_control_mobile()->is_enabled());
+
+  EXPECT_EQ(apm_->kBadParameterError,
+      apm_->echo_control_mobile()->set_routing_mode(
+      static_cast<EchoControlMobile::RoutingMode>(-1)));
+  EXPECT_EQ(apm_->kBadParameterError,
+      apm_->echo_control_mobile()->set_routing_mode(
+      static_cast<EchoControlMobile::RoutingMode>(5)));
+
   // Toggle routing modes
   EchoControlMobile::RoutingMode mode[] = {
       EchoControlMobile::kQuietEarpieceOrHeadset,