Used quite extensively in Eve Burst Error.
Mirror writes to channel 3 operators 2-4 to channels 5-7. Then when 3CH* mode is enabled, redirect channel 3 fnum / key writes to channels 5-8 and mask the key on bits appropriately.
Should be disabled when a 2nd OPN or an OPNA/B/2 is bound because then the OPM does not have sufficient free channels for it. Or drop 1 channel.
Actually now that I looked into it a bit more, I don’t think this would work for anything but algorithm 7.
In other algorithms, the operators still interact with each other, and the OPM simply can’t control the individual operator’s frequency like the OPN does.