Re: Alsa Problem or Audacity Problem?
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Thomas H. George wrote:
> Question: Should Audacity have a switch to select between input sources
> or rely on Alsamixer to make the selection?
My (Debian unstable) Audacity 1.3.9 has input selection capabilities as
has every version I've used since 2001.
Edit..Preferences..Devices..Recording..Device. hw:0,0 is default, and
I've played around with 0,1 and 1,0 when I was using a SoundBlaster
Creative Live breakout box.
As far as I'm aware alsamixer (1.0.20 on my system) always uses 0,0
unless you tell it to use an alternative device with the switch -D.
Each device will have a separate Capture control for the individual
inputs available on that interface. I believe Audacity is dependant on
the settings you use here, so unmute everything and set volumes to ~72%.
> Problem: On two Squeeze systems I have found two distinctly different
> versions of Alsamixer both labeled version 1.0.20. One is capable of
> selecting an input source which Audacity can record, the other cannot.
Do the two systems have identical hardware? If so, maybe one has inputs
disconnected or there is a hardware fault.
> sources. While playing a cd I tried selecting capture from cd with no
> effect. When I switched to capture mix the vumeter bars on Audacity
Maybe you do not have the small wire from the optical drive connected to
the soundcard required for direct audio monitoring when playing CDs. I
presume you were trying to do this purely for testing purposes.
If you believe Audacity is not functioning correctly there are plenty of
other capture tools available: ecasound, arecord (part of the alsa-utils
package) and rec (part of the sox package) are three examples, which
work beautifully off the command line.
> space bar. There are also three labels input source with no volume
> bars, just a text entry in place of the volume bar. The text entries
These are switches to mute the various inputs.
Have you tried alsamixergui? This may help to understand the available
functions of the chosen device.
If this all doesn't help, maybe tell us what sound device(s) exist is on
the PC you are using.
Tim
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