hi doc, the midjay does have a full keyboard mode, but as for just having bass and drums only, you can do it but you need to set up(edit) the styles accordingly...the Korg PA1x has a full keyboard method as well, and has a solo bass function which turns off all but bass and drums, the only down is that the bass volume then gets set at 127, and i still don't believe korg have addressed this in software updates...i also believe the g70 does a full keyboard mode too, but i am not sure about the Tyros, although for the money they ask for them you'd want them to cook dinner and wash up, and then go play your gig for you as well!!!!!