Hello, we use an M-Audio Fast Track USB device to record mono speech. We face the problem that for mono recordings both input channels of the device are mixed together. But we want to record only the left channel, not the mix. If I try to record mono from the hardware device I get an error: arecord -D hw:CARD=Track,DEV=0 -f S16_LE -c1 -r44100 mono.wav Recording WAVE 'mono.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono arecord: set_params:1087: Channels count non available I think this is because it expects exactly two channels. Using the plughw device it works: arecord -D plughw:CARD=Track,DEV=0 -f S16_LE -c1 -r44100 mono.wav Recording WAVE 'mono.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono but the channels are mixed. Configuration is standard Ubuntu 12.04. The problem is the same using Pulseaudio, I guess this is because Pulseaudio uses the ALSA plughw devices as well. Is there a way to disable the mixing of the channels? Klaus -- ------------------------------------------ Klaus Jaensch Muenchen Germany Institut fuer Phonetik und Sprachverarbeitung Schellingstr.3/II Room 223 VG 80799 München Phone (Work): +49-(0)89-2180-2806 Fax: +49-(0)89-2180-5790 EMail: klausj@xxxxxxxxxxxxxxxxxxxxxxxx ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
