most people use square or pulse type waves.
but whatever, just mess around to get the sound you want. ...as for the wobble:
the LFO has to modulate the amplitude, (how loud or soft the sound is heard)
it is usually in 'sync' with the current bpm.
you can do it manually and record a performance by assigning it to a q-link slider or knob on the q-link page to make it easier to change.
...mainly you'd go from like 1/8th note to like 1/4 note to 1/16 note or something.
that's all that's happening, the mpc is turning the volume of the sound up and down in sync with the bpm, or not in sync, if you choose turn that part off, you can do it by ear alone, and still assign it to a q-link and control it via a fader or something.
its really a simple idea. ...just takes a little work to find the sound that works best for you.
-oneday2one-