[Patzag1]

Hi.
Something started to happen recently and I have not been able to isolate why:

When moving the Control Room Volume knob down from maximum, the volume drastically reduces when I reach -15 until t's almost off at -18. Continuing to move the knob down results in the sound coming back quite loud just under -18. The same thing happens although less drastically at -25 db.
The exact spots where this occur is 100% reproducible. Changing the monitor calibration does not alter the behavior. It's still at -15.

The same thing happen when I solo an input and use the solo knob, so I'm pretty sure it's not the volume encoder - the encoder display is also very smooth, unlike the audio output.

Could be the MC524? But I swapped the 2 cards and the problem remains the same.

Any ideas?