Intro: Dual-use Headphones!
I took an old pair of thise ancient beige headphones with the 1/2" jack and modifed them. I did this mod because I learn songs off you youtube on my piano and didn't want to keep switching headphones. I painted them black and orange, added 2 switches and a 3/4" jack into them. I wired it up so that with both switches up it recieves audio from the piano, and both switches down it recieves audio from the 3/4" jack. When I get a diode I am modifying it so that you can have one source in each ear, in case you are trying to play along with a song. They work great!
Sorry about the w