>Hi, > >I have four Audio Nodes. One of them is an output node where audio is played >on the speaker. The first and the second mixer provide audio to the third >mixer which is connected to the output node. >I am trying to change the volume of my first or second mixer at runtime. On >the third mixer the following works quite good ( >CheckError(AudioUnitSetParameter(self->mainMixerUnit, >kMultiChannelMixerParam_Volume, kAudioUnitScope_Output, 0, volume, >0),"Couldn't set volume");) > >If I try the same on the first or the second mixer, no error is returned and >if I check for AudioUnitGetParameter the right volume is returned. However, >the volume is not changed on the speaker. I also tried to change the volume >on the third mixer’s input ( > CheckError(AudioUnitSetParameter(self->mainMixerUnit, >kMultiChannelMixerParam_Volume, kAudioUnitScope_Input, 0 or 1, volume, >0),"Couldn't set volume“); ) but get the OSStatus 1. > >Have you any idea how to change the volume of a matrix mixer if it is >connected to another mixer?
For a matrix mixer example see the MatrixMixerTest sample - setInputVolume, setMasterVolume, setMatrixVolume & setOutputVolume methods in MixerController.mm. < https://developer.apple.com/library/mac/samplecode/MatrixMixerTest/Introduction/Intro.html >
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