skrodahlA version that excludes the ESP32 and adds LEDs has been requested. So I made one. Eagle project files and Gerbers are available in the files section.
Here it is (just imagine the drum roll first):
Lo Tech Muffsy Stereo Relay Input Selector - Without ESP32
A project log for Muffsy Stereo Relay Input Selector
Open Source, versatile audio relay input selector controlled by an ESP32
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