I recorded some audio using the Montage's recording feature. Does the Montage provide a way to play back recorded audio in a loop?
You'll have to assign loop points off-Montage as there is not a facility to do this onboard.
Misc background:
https://www.yamahasynth.com/forum/looping-custom-samples-wave-files
https://www.yamahasynth.com/forum/wav-file-loop-playback
https://yamahasynth.com/forum/can-the-tracks-be-set-to-loop-in-the-song/latest
https://www.yamahasynth.com/forum/montage-player-function
https://yamahasynth.com/forum/sequencer
There are public domain utilities which can be used to modify loop points.
Software discussed:
Current Yamaha Synthesizers: Montage Classic 7, Motif XF6, S90XS, MO6, EX5R