Audio + MIDI channel routingMixbus is trying to make things "easier" by showing you only the connections that are suitable for that track. In many simple cases (such as selecting an audio input for recording) it does very well. Some examples:
- A mono audio track's Input list will show you all of the "mono" sources that can be quickly assigned to it. For example you should see your soundcard inputs here; but you won't see the stereo outputs of the mixbuses.
- A stereo audio track's Input list will show you all of the "stereo audio" sources that can be quickly assigned to it. For example you should see the outputs of the mixbus and master bus here; but you won't see your soundcard inputs in the list.
- A MIDI track's input list will show you all of the MIDI sources where you can pick MIDI input for the track (*)
- A MIDI track's output list will show you all of the MIDI destinations where you can send the MIDI output of the track (*)
(*) this is often where it gets confusing. If you have an instrument in the track, you probably want to assign the instrument's "Audio" output, not the MIDI. When you click "routing grid" for a midi track, you're actually looking at potential MIDI destinations, not necessarily audio destinations for the instrument's output.
Further confusing: a track can have a combination of midi and audio outputs ( for example, consider the case of an instrument track with midi input, and then audio + midi outputs )
I find that, if you get confused, it is best to visit the separate MIDI or Audio routing grids, available in the Window menu. If you want to connect the audio output of a multichannel instrument to 2 inputs of a stereo track, your best option is to visit Window->Audio Connections.
This stuff is complicated, so there is a limit to how simply it can be presented to the user.