You are correct, it does play Bluetooth audio just fine.
What I was hoping was that I could program midi commands in Stage Traxx to control the effects in the Prime 1 to match each song as you can with other multi effect boxes that have midi. I know that the Mooer Prime 1 does not have midi but there is a Prime app:
https://apps.apple.com/us/app/prime-%E6%99%BA%E8%83%BD%E6%95%88%E6%9E%9C%E5%99%A8/id1599677290
This app installs on an iOS device and gives you complete control of the Prime 1 device. I was hoping that Stage Traxx could somehow communicate with the Prime app in the same way as it does with a midi device.