bit convert in trim edit. bit grunge as an fx. timestretch in trim edit. resampling through various effect, pitch, combinations.
it can get you some grittiness, but not necessarily exactly like some of those old school samplers.
I suggested an emu sp1200, mpc3000,mpc60, etc. emulation mode in the past here in this thread:
viewtopic.php?f=25&t=148055&hilit=emulation