No I definitely don’t need to use a relay. But I wanna. Lol.
It’s for an old RadioShack mixer I’m working on fixing up and modding.
Specifically adding mute and solo switches. Mute is easy, solo is a little trickier. Idea is Solo switch on a track opens the relays on the other tracks, as long as they don’t also have solo selected “on.” With indicator LEDs to show if the tracks are on. Using dpdt relays with dpdt toggle switches u can kill two birds with one stone there. (4 birds with 2 stones? 
)
Hopefully I can also add gate inputs (hence my noodling around with my only relay). with switches to control if you want the gate to activate either the mute or the solo