I will try to make the lfo and counter work and keep length at max, like you suggested. I've never used a counter object before, but I'm sure I can search the forum to see how to put one together, so thanks for that insight!
No external midi. Just ins and outs on the axo board (plus power input), and knobs, toggles and footswitches for control. It's already a delay pedal, I'm just looking to expand it to do granular time stretch stuff (which the factotum does excellently as a live sampler mangler!), which is why I'm trying to incorporate it
Ideally, I'd need 4 params for knobs and one for a toggle. stretch, length, feedback and 'grain size' for the knobs and forward/reverse playback on the toggle. Bonus would be a freeze-like effect (holding either the whole "sample" or just a single grain with the footswitch), but not too important.