Provided by: zita-alsa-pcmi-utils_0.5.1-1_amd64 bug


       alsa_loopback - loop back the first two channels of a alsa device to another device


       alsa_loopback playdev captdev fsamp frsize nfrags


       This  tool  is  mainly for testing whether a given soundcard works with the zita-alsa-pcmi
       library.  It will send the 1st two channels of the given capture device  to  the  playback
       device, using the specified settings.

       Note,  that  this might give massive (ear and equipment damaging) feedback if your capture
       device is connected to a microphone near some speakers connected to the playback device.


              ALSA playback device (e.g.: hw:0)

              ALSA capture device (e.g.: hw:0)

       fsamp  Sample rate (e.g.: 48000)

       frsize Period size (e.g.: 256)

       nfrags Number of fragments (e.g.: 2)


       This will loopback the 1st two channels of hw:0 to hw:1 using  48kHz  samplerate,  and  10
       fragments each 2048 samples.
         alsa_loopback hw:0 hw:1 48000 2048 10


       zita-alsa-pcmi was written by Fons Adriaensen <>.

       This  manual  page  was  written  by  IOhannes m zmoelnig <> for the Debian
       project (but may be used by others).

                                            July 2013                           zita-alsa-pcmi(1)