Roland GO:MIXER PRO-X Owner's Manual page 17

Recording a Mix of Instrumental
Performance and Smartphone Music
With the 4XCAMERA app, you can mix the sound
from this unit with the music playing on your
smartphone.
USB *6 *7 *8
INSTRUMENT
(L/MONO, R)
LOOP BACK=ON *6
LOOP BACK=ON
SMARTPHONE
IN/OUT *6 *8
LINE IN 1
LINE IN 2
MIC
GUITAR/BASS
17