Just to add a bit to Alec's reply which, of course, is perfectly correct!

If you select a drum kit and then select Program Menus / Sound Edit you get the Drum Sound Edit window. In that window you can select any note from C-2 to G8 and you have two sound parts you can assign to each note. For each sound part you can select Tone Name, Amplitude (Level, Touch and Curve), Pitch (Key and Detune), and Pan. You can also select a Reverb setting that that covers both parts.

If that's not enough, you can press Detail Edit and set or adjust Tone Dynamics, Amplitude Envelope, Filter / Eq, LFO, Effect DSP, and Controller (Mod Wheel) Assignment.

Hope this helps. I've certainly learned a lot about drum kit editing over the last few days! The mind boggles at what you can do with this instrument.

Mike