Here’s one: on the machines with retriggering, like the E12 and sample machines, turn up the retrig and play with retim below 64 or so (setting filter to taste) to get some phat bass and synth sounds. Above 64 can be good for some bass sounds, although it can start to break up and not sound solid much below that, especially for bass. Use pitch for fine tuning, and everything on page two is fair game for really shaping the sound.