Deathklaw - Delay Potentiometer noises

[lepra85]

Hi Everyone.

I built some Deathklaw dual delays. (http://www.madbeanpedals.com/projects/_folders/Delay/schematics/Deathklaw.gif) and I almost always find the same issue.
When I modify the Delay pot to set up a new delay time, a lot of strange noises appear. I tried diferent Potentiometers and all of them have similar results (more cheap the potentiometer, worse result).
I found in the web that control DC with a potentiometer is not a good option for audio. Maybe the AC noises from the potentiometer are being amplified by the TBJ and that  (plus the 2 PT2399s) causes the noises (cranks, chatters)
Anyone else had this issue?
there is anyway to improve this condition? maybe adding a resistor between the Pot a the TBJ base? Increase the filtering cap (C33)?

thanks   

[PRR]

There's no audio on the Depth pot.

C33 should filter scratch from cheap pots. You might make it 10uFd.