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i have a Problem ;) i want to record Audio from the Mic and Write it to the Filesystem with Extended Audio File Services and also play the recorded Stuff. if i only use the remoteIO with two callbacks one for read one for write it works. For the Volumen Control i want to use the MultiChannelMixer and the AUGraph. is it possible that you realize playback and recording with the same mixer and the RemoteIO? i think it must look like this: RemotIO Input -> -> Write Callback Mixer RemoteIO Output <- <- Read Callback i create two AUNodes (RemoteIO and MultiChannelMixer), how must i set the Callbacks and the Connections that one Callback deliver the AudioData from the mic and an other reads the Data from a File and both paths go through the mixer? The reading and writing is not the Problem, only the configuration of the Nodes! …and the output of CAShow: AudioUnitGraph 0x8AEE000: Member Nodes: node 1: 'aumx' 'mcmx' 'appl', instance 0x865a510 O I node 2: 'auou' 'rioc' 'appl', instance 0x865d0a0 O I Connections: node 1 bus 0 => node 2 bus 0 [ 2 ch, 44100 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer] node 2 bus 1 => node 1 bus 1 [ 2 ch, 44100 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer] Input Callbacks: {0x4150, 0x7573340} => node 2 bus 1 [2 ch, 44100 Hz] {0x4330, 0x7573340} => node 1 bus 0 [2 ch, 44100 Hz] CurrentState: mLastUpdateError=0, eventsToProcess=F, isRunning=F here is the setup code: OSStatus setupErr = noErr; AudioComponentDescription mixerDescription; AudioComponentDescription ioDescription; // the AUNodes AUNode mixerNode; AUNode ioNode; // the graph setupErr = NewAUGraph(&_graph); NSAssert(setupErr == noErr, @"Couldn't create graph"); // the mixer mixerD

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