Art SGX-NightBass User Manual page 59

Notes:
1: Factory default is channel 1, OMNI ON.
maintained in non-volatile RAM and does not change when the
NIGHTBASS is powered on.
Mode 1: OMNI ON, POLY
Mode 3: OMNI OFF, POLY
Current setting is
Mode 2: OMNI ON, MONO
Mode 3: OMNI OFF, MONO
O: Yes
X: No
55