There's also the Doepfer 182-2, a quad passive manual switch. I'm imagining some fun uses to put two different cv/gate signals into two of the switches, route those to the inputs of the other two switches to send to your two synth voices, and you've got a lot of variety without needing to repatch! No voltage control over switching though, but if you don't care about that it could work for you. Pretty cheap too!