Unfortunately cleaning the pots did not help much.
Basically it works, but I would not put the stereo channel into a group or master bus.
Though it would be o.k. for me to use only one side of the stereo channel as mono, I’m thinking about trying to replace the pots.
What kind of pot should be used for the stereo in and out?
Would a 10 K/Ohm logarithmic type fit?
If i can’t find pots that fit dimensional, would it work if i hook up the pots into a little housing outside the p5?