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Are you dealing with an "AMR" (Audio Modem Riser) or a "CNR" (Communications & Networking Riser) ?
An AMR won't seat anything but a softmodem. A CNR, on the other hand, can seat a modem but may also be used for a network interface, or on some boards, additional USB or sound ports.
Any of these functions are dependent on your motherboard chipset as the risers are basically breakout interfaces for embedded devices.
Yes, the sound goes in the one -not- named Audio...the "AMR" name comes from the softmodem being derived from the DSP emulation embedded in the north bridge, which provides both modem and audio abilities. DSP emulation technology was first used by Apple around ten years ago, with limited success (anyone remember the GeoPod?)...the technology works much better today simply because the machinery is so much faster.
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