1) Slowly cycling between high and low depth settings.
2) Slowly cycling between high and low speeds.
3) Achieving a psuedo random depth by setting the P-LFO speed faster than the tremolo speed.
I'm not sure if many of the settings will sound good. I'll probably want to modify the P-LFO's speed range so that it's even slower than the tremolo's. Mostly I'm curious if I could do it (are there any technical challenges), not if I should do it (will it sound good).