Moog MIDI MuRF MF-105M Usage Instructions page 27

voltages to the tips of the pedal control input jacks. The LFO/SWEEP
jack can also receive 0 to +5 Volt programming voltages.
AUDIO PATH: The bypassed signal goes to the LEFT/ MONO output
jack. Thus, when the MIDI MuRF is bypassed, the signal at the LEFT/
MONO output jack is the same as what your instrument is producing,
and there is no signal at the right output jack. The MF-105 will not pass
an audio signal unless power is applied to it.
page 27