umm, id be inclined to say dont do it that way! (sorry ezman)
The problem your having is because when you place the notes on the keys, your not changing the original note value
like this
hit 'preset edit' and youll see the voices you have for that preset (lets say drums)
you want kick on c1, snare on d1 and hihat an e1
if you look at the far right of the first page it will say orig and then have a note value, make sure this is set to the same key as the sample is placed.
Ezmans way would work, and for drums its wouldnt matter, but if you have a tuned synth your just asking for key/note problems
this way you havent adjusted the tunning, the sample just plays right
hope that helps