Added …DidRecreateGraph notification for when teardown/setup is required after a system error
Added sourceFormat property to AEFloatConverter
Restore source buffer mDataByteSize value after AEFloatConverterToFloat
Use AudioBufferList instead of float** for level monitoring
Added getters for channel group volume/pan/mute; fixed channel group mute setting
Added channel grouping to sample app
Simplified and optimised graph setup/management