I've already built this, but it is really simple - you won't need a step by step.
What you will need is this:
- a 1/4" mono jack
- a DPDT latching button
- a SPST non-latching NO button
- a SPST non-latching NC button
- wires & soldering stuff
- casing
The jack goes to the middle pair of connectors on the latching switch. The non-latching switches go to the pairs of connectors on either side of that.
This means that the latching switch switches between the other two switches, so you can have sustain normally on, or normally off.
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