[drtechno]

when link button is pressed on both channels it ties the VCA together, this is the stereo link compression mode that every other dual channel compressors have but the design has a certain characteristic: the highest amplitude of the different channels control the vca action of the compressor. any change in stereo imaging can be a result of
1) phase shift action between left and right compared to its sum (L+R).
2) A miscalibrated VCA buffer amp that sends the wrong amplitude to the slaved unit.

to test the compressor, send the exact same signal to both channels, both a and b channel link pushed in, and if there is any change in amplitude between the two, the unit must be recalibrated.

if only channel A link button is pushed, in the unit goes into what i called keyed compressor/ducker mode in wich channel A is compress but attenuates Channel B so the audio in channel A can be heard over the audio in channel B. (i.e. Announcement vocal on channel A is heard over the program music that is coming in on channel B)

buss-in switch just switches the which source the compressor uses, (i.e. buss or insert patch)