How does one alter the main mixer volume (or any other mixer level) in ALSA from a command line (via a simple system call)?

How does one alter the main mixer volume (or any other mixer level) in ALSA from a command line (via a simple system call)?

[Ivica Bukvic]

Hi all,

I have this small question:

Is it possible (I presume it is) to alter mixer settings in Alsa by
invoking some kind of a system call using shell (i.e. how the RME hdsp
can have its stuff altered)?

If so, what is the range of values that describe the loudest and softest
levels?

Finally, are these levels standardized?

Any help on this matter is greatly appreciated! Thank you! Sincerely,

Ico

P.S. Apologies for cross-posting.



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Re: How does one alter the main mixer volume (or any other mixer level) in ALSA from a command line (via a simple system call)?

[Jaroslav Kysela]

On Thu, 6 Mar 2003, Ivica Bukvic wrote:

> Hi all,
> 
> I have this small question:
> 
> Is it possible (I presume it is) to alter mixer settings in Alsa by
> invoking some kind of a system call using shell (i.e. how the RME hdsp
> can have its stuff altered)?

Use amixer.

> If so, what is the range of values that describe the loudest and softest
> levels?

You may specify levels in percent (0%-100%). If you are asking, how the 
levels are related to dB, then we don't offer this information.

Our idea is to describe the hardware over alsa-lib (via some configuration 
files which will describe accurately the hardware). But it's not a goal 
for the near future.

> Finally, are these levels standardized?

Nope.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs



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