I am using alsa speaker-test to set my channel gain levels with a spl 
meter and alsamixer one channel at a time.  If I run the follow command 
line -

  speaker-test -Dhw:PCH -c 6  -s 1

everything works fine and I hear pink noise from the front left speaker, 
but the tone doesn't last long enough to set the channel gain using my 
spl meter.  Is there anyway to make the duration of the tone (pink 
noise) longer.  Fifteen seconds would be sufficient.

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