Disklavier

Morning,

I plugged in my laptop, and lo and behold, it works.

Except for tracks where left and right hands are on different channels
obviously, as the disklavier only uses channel 1 it seems.

My question is whether I should go for a proper software like cakewalk
sonar home studio 6, where I can mix channels (I think ?), or if there
are cheaper (even free !) sofwares out there which would be sufficient
for me to experiment on midi files ?

The vanbasco player does not install in vista it seems, so I'm using
something else in demo mode (can't remember the name).

Thank you all

Pascal