Re: snd-usb-audio - Driver for M-Audio Fast Track Pro

[Thierry Vignaud <tvignaud@mandriva.com>]

Peter Oehry <peter.oehry@gmx.li> writes:

> > If the configuration needs to be changed at runtime, and if the
> > driver cannot do this automatically, a mixer control would be the
> > best solution.
> 
> I have some questions to the idea of mixer control:
> - Which controls would be appropriate to select either 16 or 24 Bit?
> - Is it possible to make the restriction that controls can only be
>   changed when the interface is not used?
> 
> The windows driver has the following controls:
> - Check or uncheck each interface [AnIn DigIn AnOut DigOut]
> - Selection of either 16Bit or 24Bit

if you can do it when a mixer element is altered, cannot this be
triggered when the app select 16 or 24bit?
 
> These controls can only be changed if the card is not used. If the
> settings are applied all enpoints are set to altsetting 0 and then
> the used endpoints are configured to the desired altsetting. Is such
> a behaviour possible with alsa mixer controls?

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