Plays Free tip if not mentioned here : you can latch plays free tracks by switching audio/midi mode. Works well for Hold mode. Press plays free to unlatch.
(In the video, midi plays free tracks 1-3 are latched at 1m16s)
Poor quality video, messy, but here is an experiment with plays free, one shots and fills.
Midi loopback, (cable between midi in/out) 1 bar pattern with 4 tracks + Master track, one shots triggered by Plays Free midi tracks (CC corresponding to ARM), and additional Fill trig condition (1m02s, arrow down + up + page! ).
Expressed differently, I’m using plays free track to send the Control Change corresponding to ARM, in order to arm audio tracks one shots.
It acts as FILL, but per track. You also get the benefits to use plays free synced to the sequencer whenever you press them.
Other ideas here :
Cascading playable fun - #5 by dustmotes