Jonathan Gardner wrote:
First, with my older motherboard, I could control the various output and input levels of the channels. With this motherboard, I only have one channel "Internal Audio Analog Stereo".
This looks like PulseAudio's idea of a user-friendly abstraction. Try "alsamixer -D hw:0".
Second, I never really got MIDI working, at least not that I recall in my 10 years of Linux. I know MIDI is possible, I just don't know what it takes. I've been playing with musescore which apparently plays the notes over MIDI so you can hear what you wrote, which would be nice.
Your mainboard doesn't support MIDI, but I guess you don't have any external MIDI devices anyway.
To play back MIDI data, you need some synthesizer. Try FluidSynth.
Regards, Clemens