i made my own LED/LDR combos. first it did not seem to work properly in the filter down mode. Then i noticed that guitar signal was not enough to turn the leds completely of. replaced the 5k trimmer with 25k and now it works!
EDIT: actually I found out that the main problem is that the bias voltage in down mode, defined by resistors r18 and r19 is not optimal. I replaced those with a trimmer working as a voltage divider and now i can really tune in all those crazy funky filter sounds from the pedal.
EDIT: actually I found out that the main problem is that the bias voltage in down mode, defined by resistors r18 and r19 is not optimal. I replaced those with a trimmer working as a voltage divider and now i can really tune in all those crazy funky filter sounds from the pedal.