My issue is that even though I am sending separate MIDI on channels 1, 2 and 3, it's all being played on the B-3X upper manual. This is when I have the B-3X as an instrument in Ableton Live. If I use the B-3X in standalone mode, it works fine, so I am ruling out my controller channel assignments as the problem.
MIDI From set to All Ins, All Channels. Keyboard Split OFF.
I do not have this problem when I use Logic Pro.