I can't claim to understand "sound stuff" either, but I did learn that the "0,3" is "Sound Card 0, Device 3"; the first sound card is numbered 0, though the first device on that sound card is 1, not 0. So that sets whatever plughw is to use the HDMI output (which is Device 3 on the NVidia sound card). Thanks for pointing me in the right direction; my System76 Meerkat ION is now happily producing both video and sound, running Mythbuntu 11.10!
Understanding HDMI sound
I can't claim to understand "sound stuff" either, but I did learn that the "0,3" is "Sound Card 0, Device 3"; the first sound card is numbered 0, though the first device on that sound card is 1, not 0. So that sets whatever plughw is to use the HDMI output (which is Device 3 on the NVidia sound card). Thanks for pointing me in the right direction; my System76 Meerkat ION is now happily producing both video and sound, running Mythbuntu 11.10!