In Logic, how do I record (multiple) Audio and MIDI tracks simultaneously?

Short answer : If you want to record to an Audio and a MIDI-track simultaneously, select the Audio-track in the Arrange window, record-enable it, and then select the MIDI track while holding the Shift key. Both tracks will now be selected and record-enabled.

Long answer :
In “recording options” (long click on the record button), ensure that “auto demix by channel if multitrack recording” is checked.
Ensure each MIDI track you want to record is using a different MIDI channel, and that all your controllers are likewise transmitting on the appropriate channel to control the relevant MIDI devices on those tracks. Thus you have a limit of 16 input channels – note that port information is merged and thus lost (!).
Record enable all your Audio tracks. Leave one of those selected.
Now shift-click on each of the MIDI tracks’ record buttons – they will stay record-enabled.
Leave one MIDI track selected in addition to the Audio track that’s already selected.

Record.

The above works for all real MIDI instruments. If you want to record using an Audio Instrument track as well (and you can only use one in realtime due to a Logic limitation at present), there’s an additional 2 steps before recording:

Record-pause (or Record Toggle) – so you get the little audio recording “time remaining” window…
Now shift-click the Audio Instrument track’s record button, leaving the Audio Instrument track and one audio track selected.

Record.

All MIDI information will initially be recorded on the selected MIDI track, but will be sent to the appropriate instrument so it all plays correctly during recording. When you hit stop at the end of the recording, the MIDI info will be automatically split according to channel and placed on the correct track.

The only problem is any Sysex data, which ‘by nature’ doesn’t have channel info, so will remain on the selected MIDI track regardless of the instrument it was intended for. It’s fine during recording, but has to be manually separated out and placed on the appropriate track for correct playback. It gets more difficult if there’s Sysex for more than one instrument (!).

Alternately to all the above, you can of course just record to a single MIDI track object, and cable that to all the appropriate instruments. The channel restrictions still apply of course. You’ll have to split the data by channel manually if/when you need it separated, but it does make the record-enable procedure vastly simpler – just shift-click the single MIDI track’s record button after record-enabling the Audio tracks.

Logic doesn’t handle realtime multitrack MIDI recording at all well. Something more like Digital Performer, whereby MIDI tracks each have a selectable MIDI input source (and port!), and stay record-enabled when deselected, would be a very useful addition. This behaviour would be selectable as an option, in addition to the regular “put it all on one track” mode of course.

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