Audio recording is disabled when receiving MIDI Clock sync. Please use MIDI Time Code to record audio while receiving MIDI sync.
This can be adjusted from the MIDI/Sync preference tab, where you have the following 'receive' options:
- MIDI Clock information (MIDI Clock)
- MIDI Time Code information [MIDI Time Code (MTC)]
- Communication from Ableton Link (Ableton Link)
- None (Off)