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Yes now that I look at it closely, that is most likely the problem. It looks like it is the right pad of R51 and also the LED negative pad for the vactrol. Where should I connect these to with a jumper?

UPDATE: I found the build doc and looked where the tracers were and connected those in question with jumpers but still not working. Oddly enough, I noticed it is when I touch C34 that I notice the modulation start working and LED light up then fade out. What could be causing this?

So the delay works fine and everything. The modulation not so much. It is very odd, in that when I touch on the area firmly around the modulation components the LFO kicks in and I get modulation, but when I let my finger off of it, it gradually fades out the modulation. The LED indicator affirms this activity. I have been messing with this for some time and there are a couple solder pads that got kind of messed up but none where both sides were removed. I'm not sure what could be causing this, any idea what I should do or check specifically here?

It is pretty damn loud yes, if that's what you mean. At least compared to other effects. I just cannot figure this one out and it's very frustrating. I don't know how to read schematics well and I just would like to know what specific area to look at that would cause this to happen. Thanks for any help.

Hi all, I have been working on this thing for months, finally revisiting it now. It works perfectly fine in the up mode (the one that would be an the wah pedal going up) but when I switch it to the other mode it seems to do nothing. I have tried adjusting all the settings to different things and nothing seems to help it. I know what an envelope filter should sound like as I own a Qtron+ as well and this thing is just not working right. It basically sounds like a dry signal that has been slightly distorted. Can anyone tell me which particular area would be causing this particular problem? I have reflowed several times and double checked all my values to no avail. IC voltages seem to be right. I have no idea anymore...

So I just finished this up, and it seems like it partially works. Everything seems to work fine when it is in the UP mode (I think, whichever is the opposite wah sound) but when I switch to the DOWN I get dry signal plus a bit of noise in the background which sounds like the filter working. Any idea what particular area I should look with such a problem?