I use exactly the same method for input volume adjustment, albeit for just one mixer unit; AudioUnitSetParameter(myPlayStruct.mixerAU, kMultiChannelMixerParam_Volume, kAudioUnitScope_Input, 1, 0.0f, 0 ) ;
In this case the volume is set to zero (0.0f), and it works fine for my user-controlled muting. Have you triple checked your AUGraph topology, that might be allowing things to seemingly work, but not be actually hooked up the way you intended.
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