According to the nice people at my local electronics/computer shop, a lot of people have asked for this but no one anywhere sells it. Maybe someone here can help.
I (like many, many people) have my computer audio going to a setup with speakers in front and back. My sound card has two outputs, a stereo output for the front speakers and one for the rear speakers. What I want is a device with a knob or button; when I turn this knob, I select between headphones disabled and all four speakers active, or headphones active and all four speakers disabled.
Regular switches will not work (i.e., don't put this link in your answer http://www.radioshack.com/product.asp?catalog_name=CTLG&category_name=CTLG_004_002_007_000&product_id=26-204
). Every single headphones switch I have seen will only acccept ONE (1) line from the computer. As I described, I've got a line for the front speakers and a second one for the rear. Ideally, when the speakers are disabled I'd like to have a mix of front and rear sent to the headphones, but I'd be happy enough if only the front went to the phones and the rear got lost.
I'll accept either of two answers to this question:
1 - a link to a product page where I can buy it
2 - a schematic for a circuit to build it, but only from a design that has actually been built and used
Note: if you've got the schematic, you may want to start a small home business. www.unicornelex.com
will place an order for a bunch of them, I'm certain.