EXS 24 Logic Sampler Users Group

Hi.  I have a G4 1.25 (old model) w/ 1GB RAM with a RME Hammerfall 
9652, Logic 5,5 OS 9 and a dedicated sample hard drive.

When I play samples from the EXS, I get crackles and pops.  When I 
bounce an EXS track, I see digital errors on the waveform; the waveform 
drops off in a square at each pop and click.  Right now I can't use my 
EXS!!!

I hope someone can help because I'm paralyzed.

Thank you,
Min