look 4 a sound that is close 2 what u like, use randomise funtion, quantizers, chorders, use irregular step lenth, record some cc controllers for stuff like cut off/ reson/ lfo mod amount/ osc octave/ lfo pitch mod... now go thru pre-sets and they should squeal/ fart/ scream etc...

Duplicate synths and sequences but use different pan, cut off/ reson/ lfo mod amount/ osc octave/ lfo pitch mod.

just a few from the top of my head!

Z