I got a clunky workaround for part of this. I got nostalgic for my old akai with this straight-into-loop sampling ‘dj sampler’ style thing, so I wanted to make it happen!
Track 1 is a thru set to A B, but HOLD max REL zero (or near zero)
Track 2 is a flex set to its own rec buffer. Timestretch off, loop on, set to record A B, but with TRIG set to HOLD
Track 2 must be the active track. Quick rec must be on
Without running the sequencer you hold track 1 trig button (step 9 button) to monitor the incoming, then hold the recA B button to sample the bit you want, keeping the trig button held too. When you’re ready to loop you release those two buttons just as you press the track 2 trig (step 10 button) - switching from live input to loop. yay. kinda…
So I don’t use pickups much but I’m pretty sure this method dodges the BPM locking and would allow for several independent loops grabbed on the fly and running at different durations…