extras/audio plugins/wrapper/formats/AudioUnit/juce_AudioUnitWrapper.cpp

@@ -143,6 +143,12 @@ public:
                 outDataSize = sizeof (UInt32);
                 return noErr;
             }
+            else if (inID == kMusicDeviceProperty_InstrumentCount) 
+            {
+                outDataSize = sizeof (UInt32); 
+                outWritable = false; 
+                return noErr;
+            }
         }
 
         return JuceAUBaseClass::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
@@ -166,6 +172,11 @@ public:
                 *(UInt32*) outData = (juceFilter != 0 && juceFilter->isNonRealtime()) ? 1 : 0;
                 return noErr;
             }
+            else if (inID == kMusicDeviceProperty_InstrumentCount) 
+            {
+                *(UInt32*) outData = 1;
+                return noErr;
+            }
         }
 
         return JuceAUBaseClass::GetProperty (inID, inScope, inElement, outData);