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Old 03-26-2006, 07:14 AM   #1
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not able to record sounds with C-Media Electronics CM8738 sound card


I just installed a new sound card: CM8738 by C-Media Electronics. Basic installation was a breeze in Windows and Linux. I'm able to play sounds in both systems.
However recording sounds gave me some more trouble. I got this working under windows, but not properly so under Linux
Under Linux, when I say something in the microphone, I actually hear this in the speaker. But I can not record any of it. Under Windows I can.
Here is what I tried:

sohail@thabox:/home/sohail/temp$ arecord -f dat -d 0 rec.wav
Recording WAVE 'rec.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Aborted by signal Interrupt...
sohail@thabox:/home/sohail/temp$ aplay rec.wav
Playing WAVE 'rec.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
The second command should have produced the recording on the loudspeakers, but I hear nothing.
Using alsamixer, I see that nothing is muted and every thing is turned up max volume.
Any Ideas guys and girls?
Old 03-26-2006, 09:52 AM   #2
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Hmmm... recording seems to work with audacity. Just installed it. Wonder what the hell is wrong with arecord and krec. Oh well...
Old 03-26-2006, 10:05 AM   #3
Registered: Sep 2005
Location: Laurel, MD, USA
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I had the same problem with this soundcard - I tried it out by putting a mic near my guitar amp, but couldn't hear anything played back unless I cranked it up to insane levels while recording and stood outside the room. Unfortunately, it seems that you have to put the mic through a preamp before running it to the microphone input (couldn't get anything through 'Line In'). Maybe the ALSA drivers don't set the recording volume correctly or something?


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