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I recently purchased two Rocketfish 5.1 PCI Sound Cards from Best Buy. These are going to be used for audio production and radio broadcasting, so one card can handle live audio, the other can handle cue audio. After installing both cards, I get strange noises from the broadcasting program, and then the computer locks up solid. I have to hard restart to get it back up. This only happens when the two audio cards are installed on the computer. I have tried switching them around to different PCI slots, with the same result.
I've never had a problem running more than one audio device. It all depends on the software. – Ignacio Vazquez-Abrams – 2010-06-11T22:49:13.050
That's why I suggested that sound mixing is done on hardware and then recorded/broadcast on the computer. As long as the hardware is not faulty, this works 100% of the time. From what I can tell(Google search), Microsoft support says you can only use one device at a time by design. You can swap the input/output devices as needed, but you can only have one. That of course doesn't mean it can't be done. There are reports that it is possible, but I have yet to see how they did it. If you can figure it out, post it as an answer so we all know how to do it. – Doltknuckle – 2010-06-14T17:52:44.133