Ah hah! That’s what did it!
I actually was able to remove p-locks entirely, where I have both Track 1 and Track 2 transmitting on Channel 1 to the Digitone - with the entire OT track’s CC 94 value set to 0 or 1, and I swap mute states on either track to get it to play or not play. This actually works better too because now, in the arranger mode, I can just control the OT track mute states there! I just need 2 OT midi tracks per Digitone synth track, but that works since it’s 8 and 4 respectively. This is great! Thanks for pushing me in the right direction @Open_Mike!