Maybe someone can help me out on this. I´m building a drone synth plus a delay in a single box, and basically want a toggle switch to choose between the two outputs. synth/synth+delay
If you already have a “synth” and “synth+delay” signal somewhere in your circuit, then you need a SPDT. Middle pin to your output, left pin to the synth, right pin to the synth+delay point. The first picture you linked to is actually a SPDT.