As an additional thought if you wish to proceed along these lines is; EQ the individual drum sounds or sections (Snares, cymbals etc.) and save as a new drum kit or style. (That way you will not need to make multiple passes)
I am not familiar with the capabilities of the key board you mention, (These features may not be available) but it may be worth looking in the edit settings to see if the above can be done.
Apart from that carry on, and follow Diki�s advice.

Bill