A well today I recapped most of the effect pcb (the 'brain' part of the board.) when I reconnected, the effect speed pot seemed to control the resonance, cutoff and volume. Then after a few power off and ons it went back to the initial problem. I will add the the volume is extremely loud in the headphones, I can't turn it passed 1 when the effect pot is fully turned clockwise. If anyone has any advice I'd appreciate it as I'm a little lost as what to test next (eg ne571?)
Thanks again