I think the confusion sets in when we try to set up some kind of universal, use it for everything, rig. If I am using Onsong, it’s going to pull up the song on the BB. I scroll my lyrics without automation, using the iRig BlueBoard. With that rig, I might just want to have a tempo option available, and I might want use the Midi Maestro to give me that. With that set up, I’d have the Midi Maestro first, then the BB, the Bluetooth connector out of the BB, and it would have to go back to the Maestro Midi in. At least, I think that would work.
Now, if I wanted to then play something where I am not using OnSong, I don’t see where I have a problem. Maestro could control BB parts via midi and not screw up the works.
But what if I then find myself wanting to do some esoteric freeform looping? (I know, we can’t get that with the Aeros yet, but just for illustration…) So far, I haven’t had anything where my guitar needed to be in the chain, but now, I need my guitar and effects chain going into the Aeros, and I need to be getting tempo info from the BB. And, most likely, I’ll want the Maestro giving commands to the both the BB and the Aeros. The audio chain, I think is still a straight shot - Guitar to effects to Aeros to sound board, and BB to sound board. So the Aeros now comes after the BB in the Midi chain - Maestro to Bluetooth connector to BB to Aeros??. Is that going to work? Or does the Bluetooth connector go somewhere else in the chain? Do those things pass midi? I am using a Yamaha MD-BT01.
For me, this is where the confusion comes in. And, if I just eliminate the idea of a single universal rig, the problem solves itself, as I don’t need Bluetooth in the ambient rig.