Hi Daniel,I did read somewhere (don't ask me to find it, though) that dwChannelMask should be set to zero for audio capture, although looking at my own code for capturing 24-bit audio in 32-bit containers I've set it to SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT and it's worked fine. All my stuff has been with PCI or PCIe devices, though, not USB.
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