This can be done on the KETRON MIDIJAY - with the CROSSFADE feature. Depending on the settings of the CROSSFADE, you can actually ensure that although crossfading from one to the other (with the tempo LOCK on ofcourse), the total volume output at a givin time is fixed. This way, the audience remains on the dance-floor and can't even tell you've switched from one to the other. You can also LOCK the transpose so whatever you do to one affects the other ... etc.

Thanks,

AJ