I have a expression port on my UF8, I also have an 1/8" to 1/4" adapter. The BC3a has an 1/8" connection.
I will see if the unit can be plugged into an expression port and still work.
Trying it now............
Nope it does not work. I thought it would, sorry to get your hopes up.
The midi track does not register any info if the breath controller is connected to the expression port.
David