The M/S Stereo Mastering Compressor uses two module slots. From behind, the left stereo channel is on the right connector set and the right stereo channel is on the left connector set.

INPUT b/righ/St:
Side Chain Insert Input right/S

INPUT b/left/M:
Side Chain Insert Input left/M

OUTPUT a/left/M:
M/S Mastering
Compressor
Output left/M

OUTPUT a/right/S:
M/S Mastering
Compressor
Output right/S

INPUT a/left/M:
M/S Mastering
Compressor
Input left/M
INPUT a/right/S:
M/S Mastering
Compressor
Input right/M

OUTPUT b/right/S:
Side Chain Insert Output right/S

OUTPUT b/left/M:
Side Chain Insert Output left/M