Hi,

I dont think possible to modulate loop points using an LFO, which is a bit frustrating (it seems the AR can !).

However there are two workarounds for this :
1- you can modulate the start point of the loop manually in the sample editor and resample your sound.
2- you can set rtrig to inf, and modulate the start parameter (on the playback page) with an LFO. That way way, each time the sample is retriggered it will start at a different position.