I just finished my Serge Res Eq build and all bands seems to be working except the 61Hz. The major problem I have is a high pitched and steady sinus sound coming out of the module even without any input. The signal appears out of both upper and lower comb and the out jack and is completely independent of adjusting the pots on the panel.
Does it matter from which pot I feed the chained cw and ccw ends to the pcb? In Ken Stones build documentation these pots are 777Hz and 411Hz. I connected to 29Hz and 61Hz when the sinus appeared. Can this really be the cause?