If a user has a 5.1 sound card, but only has 2 speakers connected, it would be nice if the user could tell alsa this fact.
Then the amount of sliders in the mixer could be reduced, and also, an application could detect what the user has set up.
It would be nice for the user to only have to tell one application(maybe the mixer app) that they only have 2 speakers connected to a 5.1 sound card, and then all other applications run by the user would automatically pick up that information.
It seems to me, that the best place to store this infomation is in alsa somewhere.
It would also be nicer to have a better description language for the mixer elements, so that a single GUI mixer, could draw a diagram of how each mixer element effects which other ones. This idea could probably be expanded for some sound cards, whereby the mixer GUI could be used to let the user design their own mixer setup. E.g. The SB Live could be programmed for all sorts of different mixing setups.
So, as a suggestion, each mixer element should have extra meta info like this: -
Entry: 1
Type: output
Description: Front Speakers.
Entry: 2 Type: Mixer Description: Volume Range: 1-100 Channels: Left and Right Input comes from (3) Output goes to (1).
Entry: 3 Type: input Description: PCM stream from computer.
One could have multiple "Input comes from" and "output goes to" for each mixer element.
With this sort of information, a GUI could draw a nice diagram of the mixer.
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