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Last year I built the LETFA  and Violenzz builds and they came out good.  The problem I have with them is the volume output is quite low.  The effects sound good. I just can't quite hear them loud enough.  I double-checked all the values and everything seems correct.  Not sure if swapping components with different values or increasing the Pot values will make a difference. Just don't want a bandaid resolution, if I can avoid it... Please advise.

I just got my Merman build completed on Saturday, and have run into problems.  There is no bypass signal, and switching signal is only present when a high gain pedal is in front of it.  I did an audio probe today, and got mixed results.  From the first image, I have marked the parts that are giving a clean signal, and other parts that are giving a screeching signal.  At first, I thought it was an op-amp issue, so I swapped out the op-amp that had a screeching signal (OPA2134) with a TL072CP, but still got the same results.  I put the original op-amp back in, then stepped away as I thought about it for a while.  I went back to do another audio probe, and now I am getting a whistling signal from the pedal, without having the probe touching any components.  I tried to probe, but no signal came from it because the whistling is still happening (whistling occurs when both Drive and Level are dimed out).  I thought that maybe it was because of the location of the op-amp, so I moved the op-amp on the left to the right, and the right one to the left, but the original one on the left kept whistling.  Maybe it's an issue with the op-amp.  Not so sure. 

I have only been doing pedal DIY since April 2020, so I don't have a lot of experience with troubleshooting these matters, and any help is much appreciated.

I can't find anyone who has a 422k 1/8 watt resistor in stock.  Is it possible to use a 470k resistor instead?  If not, is there an equivalent to use?

I'm trying to build the Smoothie 2020 phaser, and have ran into a problem.  The volume of the pedal is very faint, and there is no phasing effect.  In the build doc, under the voltages section there is a blurb "9.42v DC One Spot".  Does the pedal require this type of adapter?  If so, who has something available?  Thanks.