EXS 24 Logic Sampler Users Group

I am running a Bosendorfer 275 piano in exs24 under lap 5.5 on os 9.2 
and x.2.6 with 786 Mb memory (w/ virtual memory under os x lap) and 
getting pops and clicks and hanging notes. I have been getting this 
with smaller sized sounds too. Anyone know of common reasons for this 
kinda deal? I'm not sure if maybe it is weird signal sent via my midi 
controller (Roland A50) or something set weird in my puter which I 
think should be fast enough (1Ghz powerbook). I am only running the 
piano on one track and the CPU monitor is superlow when it happens.

thx,

simon