hello all
i just finished the Mad Bean Sunking pedal. It all went pretty well except my pots were wired backwards. genius that i am...

anyway, it sounds pretty good and as expected except when the effect is engaged there is a faint but audible high pitched squeal present. you can here it when i'm not playing with amp at a reasonable volume. i tried wiggling wires and even replaced the wires from OUT to SWITCH to OUTPUT JACK with shielded mini cable (grounded by the AC adapter jack). nothing helped. it's not 60 cycle hum but something far higher in frequency. dogs would hate it! charge pump chip is 7660 CPA.
anyone experience this? or from another pedal?
chain: 1989 Fender Strat Plus with Hotrails -> Sunking -> 1948 Gibson GA30. Amp grounded at chassis. AC adapter for Sunking 9.7VDC. The Gibson is the only amp i have around at home right now so cannot test with another quite yet. gotta hit the studio...
thanks for any insight or suggestions,
andy