Nowt to do with MIDI channels.
Once a cell is selected there is an option to assign to different outs.
If you look at the Cubase SX / SL mixer you will notice that there are 8 outs for Battery. When you select a cell and assign it to a different output you can see on the mixer the newly assigned sound comes out on the new channel.
As Juho explains it is all in the manual.
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