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On the initial testing with a guitar and amplifier I was mortified for a minute when I heard the noise. As I had suspected the meter was injecting 9 volts into the circuit and was making a lot of noise. When the meter was turned off the vast majority of extra buzz went away. However it seemed like there was still a little more buzz than I would have hoped for. I took a short break and grabbed some Mogami shielded wire and decided to replace the original cloth covered push back wire with shielded cable. I would use the center of the wire for the positive signal and the shield soldered to ground on just one end. This way any electromagnetic interference picked up by the shield would be sent to ground. So while it felt like a setback I was fairly happy with the design and probably being overly picky about the buzz. This was never expected to be exactly like a single tone control in a guitar. There are a lot of parts in a small space and plugging a guitar that already had a tone control would be just adding more load to the circuit before getting to the amp. What I wanted all along was a fast, easy way to listen to one type of capacitor to another and see which ones I liked best. After all the shielded wire was installed the design was very quiet and subtle differences from one cap to another could be easily heard. Currently there is one capacitor not working and I haven't taken time to try and reflow the solder or just swap the capacitor out with another one. Eventually the plan includes a video so people can listen for themselves to see which capacitors they like and before that I'll fix the one problem remaining.
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