Confirm the patching about the outputs.
Ui24R has 12 bus lines as Aux (or MTX) 1 to 10, master L and R + solo bus. You should patch each of them to the physical output ports as AUX port 1-8 and ML MR (probably you described Mix A and Mix and 2 jacks of ST phones.
Comments
Confirm the patching about the outputs.
Ui24R has 12 bus lines as Aux (or MTX) 1 to 10, master L and R + solo bus.
and 2 jacks of ST phones.
You should patch each of them to the physical output ports as AUX port 1-8 and ML MR (probably you described Mix A and Mix