Might b something about a sample retriggering or jumping 2 another sample b4 the one still playing having not reached 0 volume.. meaning there is jump between different levels, which generally results in cracks and pops....
basically get a sample 2 play in polyphonic mode (at leas 2-4 samples)... DON'T use a sort monophonic (or Cut itself mode), or what ever it's called on the Battery language, which the normal mode used 4 drums 2 avoid phasing.
2 improve yer soundcards latency go here and
download the asio 4 all driver... should work like a charm...
get a ESI (Ego Systems) Juli@ soundcard they're unbelievably good and cheap!!!
Z