On Sat, 8 May 2004, Jos Laake wrote:

> Hi all,
> 
> I'm a newbie to this forum but a long-term music/geek.  Here's what's
> going on for me.
> 
> I'm trying to do multi-track recording using 'Audacity' on Linux.  I'm
> using:
> 
> RedHat Linux 9
> ALSA driver 1.0.4
> Audacity 1.2.0
> Creative Labs SoundBlaster MP3+ USB Audio Adapter
> 
> In 'Audacity' I can record via the line-in, but the only other options
> listed for recording are 'pcm' and pcm2', no 'line-in'.  Neither one
> of these 'pcm' thingies works when using the SB-MP3+'s 'line-in' jacks.

Sorry, something happened to your post. You can record via line-in but
no line in? If what you are saying is that by plugging a source into the
line-in jack on the card, and using say arecord you can record, but that
there is no slider to alter the volume of the line-in recording, then it
maybe that the card has no volume control for the line-in. Or it may be,
as on many cards, that the line-in volume control controls only how much
of the input is fed back into the output on the card. On many cards, it
is Igain in the alsamixer which controls the input volume, but I have
also heard of cards which have no input volume control. Alternatively
they may label the input volume control as Mic. 


> 
> Has anybody else seen this kind of problem?  Any pointers to good
> resources?  Any advice?
> 
> Also, how does 'snd-usb-audio' interact with 'audio.o' that ships with
> RedHat 9?  In order to get anything to work under 'ALSA', I need to
> manually 'insmod snd-mixer-oss' and 'insmod 'snd-pcm-oss'.  This seems
> to pull in 'audio.o'.  Is this correct?  Any clues?

It sounds to me like you want to use the OSS emulation, rather than alsa
directly. you then want to put lines like thse into /etc/modules.conf

alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss



These set up the various OSS sound emulations. 
 


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