Here's my issue: I'm a guitar player, and I recently purchased a nice set of USB headphones. My intention was to plug my amplifier into the line-input on my computer and then use the headphones. However, because the headphones have their own sound card, it doesn't work. Basically my integrated sound card (which has the line-in or mic jack, I've tried both) won't sent the signal over to the USB sound card built into the headphones. So I can't hear my guitar over these headphones. I need to know how to make this work. So far the closest I've come is using a recording program that plays as it RECORDS, but it has lag (it's really disorienting to play guitar and listening to everything a second or two after you play it). I've played with all of Windows XP's MIXER settings and got nowhere. Does anyone know how to do this?

The other issue is practically the same problem but with my TV tuner card. I don't have a TV, just this card for my computer. However, the tuner card has an audio-out port like most CD drives have, that plugs straight into the sound card (my integrated one). I can't hear TV on my headphones, either.

It seems to me that all I need is some kind of ROUTING or BRIDGING software that will send the input signal from my integrated sound card to the USB one. The USB headphones have no inputs of any kind.

My integrated sound card is a Realtek AC97. My headphones are LTB Mentor True 5.1 USB Surround Sound.

I know I can use standard analog headphones on my AC97 speaker out and have that work, but then I'd have to return these USB headphones, which I don't feel like messing with unless absolutely necessary.If the USB HEADPHONE is a proper soundcard (I've never seen those things, so I might be mistaken) you should be able to select it as a recording device under Start -> Settings -> Configuration -> Sound and Audio Devices -> Audio tab. Choose a soundcard accordinglyIf I were you and had the option to return the USB headphones, I think I would do so. Then, I'd start looking for a sound card to replace the onboard sound and for some standard headphones that would connect to a regular phones jack on the sound card. Seems to me this hardware would serve your purposes better than what you're trying to work with now.