Most of my audio gear is used at my desktop setup to prevent wear and tear that would otherwise occur if brought on the move with my Macbook. My motherboard, AsRock Z97 extreme 4, has an on board amp but only supports my front panel headphone jack (in other words, the headphone jack in the IO assembly of the motherboard is non-amped). I wanted to use the “amped” front panel port with my Fidelio X1’s as well as my desktop speakers so to do this, I needed either an earphone splitter or an audio switch. I ended up choosing the latter because the audio switch could be used as a 1 input -> 2 output as well as a 2 input -> 1 output switch, hence choosing the audio switch would be more useful and versatile if I ever decided to switch up my monitor setup. Anyways after searching a few tutorials on the wiring diagram of headphone jacks I learned that stereo headphone jacks are basically 3 pins that consist of (ground, left and right). So all in all it was a pretty simple circuit because ground was wired together while left and right were wired respectively to the main output/input jack. Fun little project and learned a bit about audio wiring.
A few things that I could expand on would be, toroids to cancel out the noise from the jumble of wires in the switch box and figuring out the reason why Fractal Design’s audio jacks are wired differently than standard PCB headphone jacks.