I drilled a hole for a 1/4" mono input jack, which has two terminals. After many attempts testing the input, I discovered which terminals should go where. One terminal is wired to the ground of the volume pot, and the other is soldered to the JP1 jumper switch. I tried multiple locations of where the second solder should be, included on both sides of R6 and R8. Across R6, it eliminated the push-pull option for the tone pot. Across one terminal of R8 created a mute button, which just silenced the sound output when pressing the foot switch. On the other side, the button created a metronome style click, which is useless.
The foot switch is a single button, SPST Johnson foot switch. The cheapest one on Amazon. I like the way the switch is wired up now. When the JP1 switch is off, the foot switch barely notches up the volume. If JP1 is up, then the foot switch toggles a louder, cleaner volume output. This easy volume boost is useful for playing solos live.
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