Banana, I livebooted into Trisquel 7 and had the same problem. It all looked
connected on my monitor, the Mojo speaker did its happy "I connected!"
jingle, and then it played the audio from the speakers, even after I went
into sound settings and clicked furiously on the "Output-Mojo" option.
On a less important note, in both Trisquel and Ubuntu, I have to remove Mojo
from known devices before reconnecting to it. I imagine that's a separate
issue, though. My main focus remains getting the speaker to play audio in
Trisquel.
I have another Bluetooth speaker somewhere around here. It's semi-broken but
I'm gonna see if I can get it to connect to Trisquel and Ubuntu, just for the
sake of variable isolation.
