The 4 Band M/S EQ uses two module slots. From behind, the left stereo or M channel is on the right connector set
and the right stereo or S channel is on the left connector set.

INPUT b/right: not used

INPUT b/left: not used

OUTPUT a/left/M:
M/S EQ
Output left / M

OUTPUT a/right/S:
M/S EQ
Output right / S

INPUT a/left/M:
M/S EQ
Input
left / M

INPUT a/right/S:
M/S EQ
Input
right / S

OUTPUT b/right:
not used

OUTPUT b/left:
not used