G-Lab M4L User Manual - page 6
4
Scheme and signal path description
M4L has true passive signal path (without signal boosting and buffering
elements). Due to this the M4L doesn’t influence the guitar tone (doesn’t
change the tone and doesn’t cut the signal). It is recommended to use the
M4L to “exclude” from the effects’ signal path the effects without true bypass
function. Controlling by MIDI provide galvanic separation from controlling
device. Every time after switching on the power supply four effect loops are
switched off and the signal path is “opened”.
Manual loops switching
For manual loops switching there are used four buttons signed LOOP1,
LOOP2, LOOP3 and LOOP4. To switch on/off the loop press corresponding
button.
MIDI channel setting
To set the MIDI channel use the rotatable knob signed as MIDI
CHANNEL. To switch the channel use the small screwdriver to turn smoothly
central part of the switcher to the right or to the left. The arrow-head indicates
set channel (letter A, B, C, D, E, F correspond successively with the channel
numbers 10, 11, 12, 13, 14, 15, and number 0 indicates channel 16).
Controlling via MIDI commands
M4L can by controlled by Program Change commands. The table below
shows the Program Change command functionality.
LOOP
PROG. CH.
1
2
MUTE
1X
OFF
OFF
OFF
2X
ON
OFF
OFF
3X
OFF
ON
OFF
4X
ON
ON
OFF