Hey, I just found that you can set a MIDI channel on a Utility track!

Right-click on the realtrack, select Track Settings and MIDI Channel.
Select a MIDI channel and the utility track will play both realtrack and MIDI on your selected channel. (Which makes for some nice layering...).

If you don't want this, try setting "Do not re-route (multichannel).

MIDI is still wonky, but now I can use my piano on channel 1.