diff --git a/Audio/Output/OutputCoreAudio.h b/Audio/Output/OutputCoreAudio.h
index c6e6603fd..11199266b 100644
--- a/Audio/Output/OutputCoreAudio.h
+++ b/Audio/Output/OutputCoreAudio.h
@@ -19,6 +19,11 @@
 
 #import "Semaphore.h"
 
+//#define OUTPUT_LOG
+#ifdef OUTPUT_LOG
+#import <stdio.h>
+#endif
+
 @class OutputNode;
 
 @interface OutputCoreAudio : NSObject {
@@ -51,6 +56,10 @@
     size_t _bufferSize;
     
     AudioUnit _eq;
+    
+#ifdef OUTPUT_LOG
+    FILE *_logFile;
+#endif
 }
 
 - (id)initWithController:(OutputNode *)c;
diff --git a/Audio/Output/OutputCoreAudio.m b/Audio/Output/OutputCoreAudio.m
index 99f4dddb6..188a2bf4a 100644
--- a/Audio/Output/OutputCoreAudio.m
+++ b/Audio/Output/OutputCoreAudio.m
@@ -152,6 +152,10 @@ static OSStatus renderCallback( void *inRefCon, AudioUnitRenderActionFlags *ioAc
         writeSemaphore = [[Semaphore alloc] init];
         readSemaphore = [[Semaphore alloc] init];
         
+#ifdef OUTPUT_LOG
+        _logFile = fopen("/tmp/CogAudioLog.raw", "wb");
+#endif
+        
 		[[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:@"values.outputDevice" options:0 context:NULL];
         [[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:@"values.GraphicEQenable" options:0 context:NULL];
         [[NSUserDefaultsController sharedUserDefaultsController] addObserver:self forKeyPath:@"values.GraphicEQpreset" options:0 context:NULL];
@@ -589,6 +593,10 @@ default_device_changed(AudioObjectID inObjectID, UInt32 inNumberAddresses, const
     __block AudioStreamBasicDescription *format = &deviceFormat;
     __block BOOL *eqEnabled = &self->eqEnabled;
     __block void *refCon = (__bridge void *)self;
+    
+#ifdef OUTPUT_LOG
+    __block FILE *logFile = _logFile;
+#endif
 
     _au.outputProvider = ^AUAudioUnitStatus(AudioUnitRenderActionFlags * _Nonnull actionFlags, const AudioTimeStamp * _Nonnull timestamp, AUAudioFrameCount frameCount, NSInteger inputBusNumber, AudioBufferList * _Nonnull inputData)
     {
@@ -631,6 +639,12 @@ default_device_changed(AudioObjectID inObjectID, UInt32 inNumberAddresses, const
             }
         }
         
+#ifdef OUTPUT_LOG
+        if (logFile) {
+            fwrite(inputData->mBuffers[0].mData, 1, inputData->mBuffers[0].mDataByteSize, logFile);
+        }
+#endif
+        
         inputData->mBuffers[0].mNumberChannels = channels;
         
         return 0;
@@ -726,11 +740,18 @@ default_device_changed(AudioObjectID inObjectID, UInt32 inNumberAddresses, const
         AudioComponentInstanceDispose(_eq);
         _eq = NULL;
     }
+#ifdef OUTPUT_LOG
+    if (_logFile)
+    {
+        fclose(_logFile);
+        _logFile = NULL;
+    }
+#endif
 }
 
 - (void)dealloc
 {
-	[self stop];
+    [self stop];
     
 	[[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self forKeyPath:@"values.outputDevice"];
     [[NSUserDefaultsController sharedUserDefaultsController] removeObserver:self forKeyPath:@"values.GraphicEQenable"];