6. Now a word on DPDT (dual pole, dual throw) switches.



The connections on a DPDT switch are set up in 2x6 configuration. For the purposes of this project, we can think of the 2 connections in the middle are the main output, and each of the 2 connects on either side are like audio channel 1 and 2. Each set of connections is broken into right and left channels.

Whichever way you flip the switch, it allows current from the terminals on the other side. You flip it to the left (like in the picture), and it allows current from the right terminals to pass to the middle terminals, and vice versa. I didn't realize that until I got everything working, but I was able to swap the Legos around to make it work the way I wanted it to.