Tresor,
Oh yes, you can turn off the bass and just use drums, and you can even turn off the drums and just use bass too. I do remember reading several posts about other users not knowing how to do this. It's actually a very easy function to perform on the unit.

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.