Re: [linux-audio-user] Starts with a pop

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Subject: Re: [linux-audio-user] Starts with a pop
From: Jamie Guinan (guinan_AT_bluebutton.com)
Date: Thu Sep 30 2004 - 20:04:18 EEST


On Wed, 29 Sep 2004, Greg Reddin wrote:

> This is something that has bugged me ever since I built my Linux DAW.
> When I boot up, when I start jack, when I open a web page with
> Flash, when I get a licq message -- anything that uses my audio
> driver, I hear a fairly loud low-end pop.

I just had a similar thing happen to me, with a Delta 66 (also an
ice1712), after playing with the command-line alsamixer. I'm driving a
pair of powered monitors from H/W Out[1,2].

Running envy24control, I found that I had set Master Clock to 88200, where
I normally keep it at 48000. In fact, switching between 88200 <-> 48000
in envy24control produces the pop every time. The pop is much louder in
the right (Out2) channel than the left, for some reason I can't explain.

Anyway, if I set it at 48000, I don't get pops when I play audio through
it ("mplayer -ao alsa1x:ice" [1]), so it seems to be related to changing
the sample rate, as other people suggested.

-Jamie

[1]
pcm.ice {
   type plug
   slave {
     pcm {
       type hw
       card 1
     }
   }
}


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