How can I set the volumn of soundcard

youhaodeyi · #1 29th May 2007, 07:53 AM

I can use amixer to set the volumn to each soundcard. But how can I know which soundcard is for record or which one is for play?

InKo · #2 29th May 2007, 09:11 AM

I suppose, you can set that using kmix...

youhaodeyi · #3 29th May 2007, 09:13 AM

But I don't have kmix command in my system.

InKo · #4 29th May 2007, 09:16 AM

well, I would install it, very nice tool...

as root:

Code:

yum -y install kmix

youhaodeyi · #5 29th May 2007, 09:17 AM

But I don't want to install any other tools. Can I use the basic linux command to do that?

InKo · #6 29th May 2007, 09:32 AM

ok!

then try at the prompt:

Code:

alsamixer -c 0
alsamixer -c 1

0 and 1 is the card number or identification.. that way you must be able to set you cards as you want!

youhaodeyi · #7 29th May 2007, 09:44 AM

But this command will show an UI. I want to get a return string by executing a command to identify each device.

InKo · #8 29th May 2007, 03:09 PM

I never did that before but in your case I would use amixer, e.g.

Code:

amixer -c 1 set PCM 2dB+
amixer -c 2 unmute cap

or something like that...

youhaodeyi · #9 30th May 2007, 02:05 AM

What does 2dB+ mean?
But how can I know PCM is volume soundcard?

InKo · #10 30th May 2007, 08:33 AM

sorry, but I said, I never did it that way, so I would recommend to read the manual for amixer.

pompeiisneaks · #11 31st May 2007, 12:17 AM

You should specify which version of Fedora you're using, on mine, Fedora Core 6, I have a tool called:

system-config-soundcard

that allows you to see any and all soundcards installed. It also is available from the Fedora start menu under:

System -> Administration -> Soundcard detection.

you can also use the terminal application to run the program

alsamixer

and it should remember the volume settings. You need to know which one is which though, but you could test and see, if you have two cards, as someone mentioned you need to use

alsamixer -c 1

or

alsamixer -c 0

for each card. The UI tool should help you sort this out though.

~Phil

youhaodeyi · #12 31st May 2007, 01:46 AM

I use Fedora 3, 6.2.9.
Must I test and see each volume setting to know each setting function? I am writing a program to control the volume, so I need to know this by running a command which can be run in the program without any human interfere.

And alsamixer is also UI command. It is for human to read, not for a program to know.