This is one for googlability (yes, I just made that word up).
If you’re running MythTV and wonder about how to get it to correctly use ALSA (it’s not in the list of sound devices, so you think maybe your build was compiled without ALSA support?), here’s a big tip: the dropdown box for the sound device (showing /dev/dsp and /dev/adsp) isn’t really just a dropdown, but a combobox. You can just as well type stuff in there, and if you type ALSA:default and it’ll use your default ALSA device just fine. Reasoning behind this is they can’t/don’t want to enumerate all possible ALSA devices in a dropdown, so they just put the standard ones and let you type the rest yourself. I’d think ALSA has a way of detecting the present devices and just show those but anyway, this is how it should be done if you want to use ALSA.