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?
Thanks,
Larissa
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