Yes you can! If you have the manual it's on page 53, the last part entitled "Changing the function assigned to the Master Slider". If you don't, here's the steps to do it:- make sure your in 'Step Sequencer', then press and hold down 'Func A/B' button on the far left of control panal, then 'Menu', then 'Right cursor >' to move to M.Slider, then 'Enter'. The screen now allows you to select which drum part to change, and very nicely on line 2, what to change; voice, groove, octave, and a few others. It's a bit long winded, but it's there. Hope this helps.