Connect wires as shown. First solder the blue and red strands of wire
to their pins. You don’t need to run individual wires, just use a
single one for each colour per row and remove the insulation right
where the solder points are.
For the shape and env switches, if you use SPST, make it so that
they’re closed in the up position. If you use SPDT, the same, but
leave the third pin unattached to any wires. (For SPDT, the middle pin
will connect to either top or bottom pin depending on the position.
Use a multimeter to check if you’re unsure.)
The bite switch gets two individual wires to the PCB. They should be
connected if the switch is in the down position. If you use an SPDT
here, leave one pin empty.
The power switch must be an SPDT. Its middle pin connects to the power
(Vcc) on the microcontroller’s USB socket. You can use a short length
of micro-USB cable or make your own:
