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Here ya go...Built one of these and paired it in a combo with the Mantra OD, It's damn fuzzy!

Oh man, that sucks. It's very frustrating to have a cool pedal MOSTLY work
Good luck with your Windbag build, curious to see if you experience the same issue.

Thanks for the reply....I thought the same thing about the R1 value.
What I figured out was that if I lower R1 (orig.220k) to around 10K I can get the audio signal to unity/a usable level. BUT..even if I turn the Reverb/Delay Mix knobs all the way down, the alleged "DRY" signal still has the muffled LP filter sound.
I thought perhaps R1/C1 are actually doing their job correctly and the opamp they feed or something else in the circuit is supposed to clean that LP filter mess up, but I sure can't figure out what other part of the circuit that is..It's Frustrating, it's a cool pedal.     

NOPE...I discovered that If if I lower the R1 value, I can get the volume up to a usable level and everything else in the circuit seems to be working fine.
But even if I turn the Reverb & Delay mix knobs down, the alleged "dry" signal still has the muffled LP filter sound.
I was thinking that perhaps R1 is doing its job properly and maybe the op-amp it feeds into is supposed to clean up the audio signal or something else in the circuit. But damn If I can figure out what that is...

Thanks for responding...I thought I might've become digitally invisible. 

Hello all,
I'll try again...
I'm having a hopefully simple issue with the Windbag. https://www.madbeanpedals.com/projects/_folders/VFE/pdf/Windbag.pdf.
It works, but I get a steep volume drop and an angry LPF/muffled under-the-blanket sound when the pedal is engaged.
Tracing the audio signal it hits the relay which then sends to R1. The signal going in to R1 is strong..coming out the other leg the vol. is severely dropped and muffled and flows through the rest of the circuit at that unusable volume.
I reflowed R1, I switched R1 out for another 220K, and then reflowed that one too..and the same vol. drop/muffle happens.
If I crank the amp, I can hear everything else on the pedal doing their respective jobs; delay, reverb, envelope, etc, and sounds cool! It's just at a very low volume.
If I reduce the value of R1 to around 10K, the audio signal reaches unity, but the LPF sound on the alleged "dry" signal remains.

I checked the voltages, and they are a bit off, but I don't think they're show-stopping bad. I subbed a TL072 for the OPA2134 and a TC1044SCPA for the 7662B. My DMM doesn't do mV, so my TL072 voltage measurement is incomplete. sorry.

Any help/suggestions are greatly appreciated.

Thanks.

Hello,
I'll try again...
I'm having an issue with the Windbag. https://www.madbeanpedals.com/projects/_folders/VFE/pdf/Windbag.pdf.
I get a steep volume drop and a muffled under-the-blanket sound when engaged.
Tracing the audio signal it hits the relay which then sends to R1. The signal going in to R1 is strong..coming out the other leg it's severely dropped and muffled. I reflowed R1, I switched R1 out for another 220K and the same vol. drop/muffle happens. 
If I crank the sound, I can hear everything doing what it's supposed to do delay, reverb, envelope, etc...just at a very low and muffled volume.

I checked the voltages, and they are a bit off, but I'm not sure what to do about that.
Any help is greatly appreciated.

Thanks.