Will not stream mp3 over SOCKS proxy

Using Ubuntu 12.04 32-bit and Audacious 3.2.1 (also can reproduce on version 3.3.2)

Although Audacious has a setting to use a network proxy, it seems that proxies created using SSH (ssh -C -D), which are SOCKS proxies, do not work when streaming mp3s (such as SomaFM's streaming mp3s). I've tested that the proxy works just fine otherwise, and I have configured Audacious with the same proxy configuration as Firefox. The only difference I can see is that Audacious doesn't ask if it's an HTTP proxy or a SOCKS proxy, which makes me suspect that's where it's breaking down.