[gentoo-user] alsa strangeness...

[gentoo-user] alsa strangeness...

[karlos]

Hi,

I have just given up on a strange thing with alsa. basically I can
plug something into the proper port and hear sound coming out of the
laptop speakers, be it a mic or a synth. strange enough, I cannot
record these sounds with any of the software,
SC3-Audacity(portaudio=v19 and oss and alsa)-ardour... I have found
something strange in my kernel so I recompiled, then alsa and finally
jack too. nothing seemed to work fine.
when I open alsamixer I can adjust the levels and everything. What
could this be? Any ideas?

Karsten

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Re: [gentoo-user] alsa strangeness...

[Christoph Eckert]

> when I open alsamixer I can adjust the levels and
> everything. What could this be? Any ideas?

I guess everything is fine with your setup but your mixer 
isn't set properly.

* Your card has a monitor. Incoming signals are routed back to 
the outputs immediately. This means that the incoming data 
never left your soundcard towords your CPU!!!

* If you want to record (especially with JACK) you do not want 
this kind of hardware monitor. So switch it off in ALSAmixer

* Now ensure that your recording environment catches the audio 
input (this means unmuting and levelling the inports) and 
process it the right way. If you're using JACK maybe you want 
to use
meterbridge -n meterbridge -t dpm alsa_pcm:capture_1 
alsa_pcm:capture_2
to monitor and level the incoming signal before recording it 
with qarecord or ardour


Best regards


    ce

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