Hey! Funny you should ask. I excitedly tried this mod on the saw sampler and was disappointed to find that it doesn't work. BUT I was determined to find a solution and fired up my scope to find a signal I could use. I don't know how I missed it in the past but there is a pin right above the pitch pin that goes high during playback and then switches low. This can be used to trigger your playback and results in perfect looping. Just connect the center pin of your re-triggering transistor to this pin and your ready to loop.