Urgh. Used to work, now it doesn’t. Hail to the penguin.
Microphone plugged into SBLive! card. Turn microphone on. Use Gnome audio mixer to turn mic on. Can hear my own voice amplified over the speakers. Now try to record using Rosegarden, Ardour, or Audacity. Foggedaboudit.
Another handy link:
Anyway, here I was thinking that ALSA drivers are well-documented things. Turns out most of the cards are reverse-engineered, so even though the Alsa mixer controls have names, their meaning is not always clear…
Will try tomorrow.