I confirm, Hold works with midi tracks plays free, so you can choose rec length with Midi Trigs in Midi mode, and play recordings with Track Trigs plays free.
Trig a sample on T5.
T1 rec T5, plays R1
T2 rec T5, plays R2
T3 rec T5, plays R3
T4 rec T5, plays R4
Common settings :
Rec Setup : HOLD, loop On, Src3 = T5, Qrec = 1
Tracks Plays Free Hold, 1/16 Quantize.
Midi mode
T1 midi ch1
T2 midi ch2
T3 midi ch3
T4 midi ch4
Common settings :
One Trig Note C4, Len Inf
Tracks Plays Free Hold, Direct Quantize
Maybe you have to stop and play.
Stay in Midi Mode, use crossfader and 1-4 9-12 trigs.
You can add things in midi tracks with Trigless Locks, midi lfos, etc…