Not sure if this falls under TotalMix or UFX...

The problem is most noticeable in bass frequencies - passing a 100hz or lower tone (even to inaudible <10hz), then pull down the Main Out fader (Currently set to Outputs 1+2 XLR)... toward the bottom of the range, audible clicking is heard at each "step". So when you pull down the fader, you get "pop-pop-pop-pop..". Particularly around -20 to -40.

However - leaving the Main Out fader high, and pulling down the Software Output channel fader, or even routing it out of the unit and back to another hardware input fader.. pulling down those faders, the 100hz wave transitions to silence perfectly!

This seems a Total Mix problem, because the Software Output fader and Main Out faders produce different results, but both send audio through the same OutPut 1+2 signal path on the UFX board. So it can't (?) be a problem with the components on the board.

I tried power cycle, but it persists.

I could make a video documenting this if needed...I first noticed it playing a very bass heavy track - if there is not sub bass, the effect disappears.

Thoughts?