I frequently use the merge facility to build up a Drum track. Being a drummer, if I am creating a drum track in real time using the Composer, I like to get it as near as possible, to how I would play the rhythm on my real kit. Now this involves two feet as well as two hands, and it's a bit difficult getting all four extremities on the KN7000 keyboard, at the same time
So, I generally start off by laying down the Bass drum pattern and maybe the Hi-Hat on a single track. (Left and Right foot parts by hand) I will then play this back and add Left and Right hand parts using say Snare drum and Ride Cymbals, then merge the two tracks to a single track. I sometimes add in further drum sounds on another track and then merge again, to build up the finished single drum track.

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Willum