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Old 8th August 2020
Here for the gear

Hey I had this issue, I fixed it heres how :

The mute flip flop requires a stable power supply to work - Unstable voltage can cause the mute logic to open and close in a seemingly rhythmical way. Its a bit like the threshold of a noise gate...

The original CPS450 has trimmer pots for each rail, in my case they were dirty, I actually replaced them all. The cps is now a spare, i got a Blue Dog power supply made and that made it really solid.

Check the rail voltages on a fast meter or scope. You could also try exercising the trimmer pots in the power supply to dislodge any corrosion...

The problem in my case was not in the desk at all, but the power supply.

Hope that helps and good luck.