Tyrian squeels

[Mothman]

I've built this one and works alright except that it squeels a lot even in lower gains. Any tips?

 

[temol]

If it works alright then what's the problem? I'd say that any oscillation is "not alright".
Did you use shielded wire for IN/OUT/3PDT connections? Is there any dependence between VOL/GAIN settings or switch positions?

 

[Mothman]

I mean that all the controls work fine in their parameters, but is that squeelign. I am using a pedal tester for the pcb, but I don't really think that shielded wire will cancel this, is too much I think

 

[kahles]

Had the same problem, especially when I cranked up vol, gain and treble and had the toggle switch in position 3. When I just touched the isolation of the wire from the input jack, it got really noisy. After using shielded wires to the input- and output-jacks it got much better!