Have a look through this thread, this person seemed to want to do something similar -
This was my suggestion for perhaps the best way to do this -
Just thought of another potential method that might work for you. You can use a “plays free” track to trigger and repeat a particular slice over and over, and turn it off again when you want it to play through the rest of the sample. So for example you could manually trigger slice 1 and have it playing through the song, then when you want to loop a section you trigger a track’s sequencer which has a p-locked trig for the slice you want, then just disengage it with the one2 mode when you’re ready. That should be easy to do with a foot controller.
Ok I just did some testing and I believe the plays free track with quantised trig method is probably the simplest/best and matches the OP’s needs. It uses a single pattern which IMO is preferable for live performance/improvisation use and shouldn’t be too hard to setup.
I won’t go through every specific setting because it’ll depend on your material and other things, but here’s the basics:
Set up a static track with your sliced song track, LOOP = on, SLIC = on, and LEN = slice. Go into the AED screen for that static sample and go to ATTR page, scroll all the way down and change quantised trig to 16/32/64, whatever will match the length of one slice.
Now go into pattern settings. You may want to change scale mode to per track just so you can change that track to run slower so 16 steps = 64 which might be visually useful, it’s up to you. Go into the pattern setting page for the track with the sliced song on it and enable PLAYS FREE, then set trig mode to ONE2 and trig quant to be the same as in the attributes page or whatever works best for you.
Now on the sequencer for that track place a trig and hold it and turn the slice parameter on the SRC page to be whichever slice you would like to loop over and over, so you’ve made a p-lock just for that slice. Also make sure the length parameter on that page is as many slices as you are using for that sample.
Now to test; start the sequencer and hit the trig that corresponds to your track (9-16), it will start playing once the sequencer reaches x steps. If you do nothing it will just play through the whole thing and loop again, but if you hit the track trig for your track (1-8) the sequencer for that track will start running after x steps and continuously restart the same slice over and over, effectively looping it. Then all you have to do is hit the same track trig again, the track sequencer will stop and no longer re-trig the slice, and the song will continue.
Controlling that with a MIDI foot controller should be fairly simple to do, there’s some extra steps to that but I won’t go into that just now.
Once you have that sorted and practiced you can incorporate other tracks that will record sections of your live playing so you can do fun mangling/mixing with them. Arming one shot record trigs with a foot controller might be easiest way to handle that in a live scenario, it will take some practice.
Hope that’s understandable and useful for you.
EDIT: Oh I just remembered that I think I had to use the “per track” scale mode and set the master length to infinite for some reason, I think there was some kind of interference going on between the plays free track timing and the master sequencer restarting. It kept playing two slices instead of one which was confusing.