I'm fairly new to Linux. I have an M-Audio Fast Track Ultra that is incorrectly detected as a surround sound device. On Windows, it showed up as four separate stereo outputs, and that's how I would like it to appear in Linux.
In pavucontrol, I can choose between Analog Surround 7.1 Output + Multichannel Input, Analong Surround 7.1 Output, and Multichannel Input, none of which are what I want.
In /etc/pulse/daemon.conf, I have
...
enable-remixing = no
...
default-sample-channels = 2
...
(in addition to the defaults, of course)...