Thanks (again) for your reply avan
For anyone else who’s grappling with this - I did kind of sort it out in a way that will have to do until Overbridge comes along. I basically have four ext instr tracks in Live set to channels 1-4 so I can play midi with Push using the A4 voices. I then have another ext instr track in Live set to channel 9, with an audio track receiving from this one. In this track, as it’s set to 9, I can set trig notes on the A4 in grid mode, using Push. I can then record the sequencer into live as audio.