From alsa-devel-owner@alsa.jcu.cz  Mon Feb 22 21:05:22 1999
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Date: Mon, 22 Feb 1999 22:04:53 +0200 (EET)
From: Tuomas Heino <iheino@cc.hut.fi>
To: alsa-devel@alsa.jcu.cz
Subject: Re: Bad hissing on GUS PnP
In-Reply-To: <Pine.LNX.4.04.9902222024480.3881-100000@syrjala.pp.sci.fi>
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On Mon, 22 Feb 1999, Ville Syrjala wrote:

> On Tue, 16 Feb 1999, Andy Lo A Foe wrote:
> >
> > Hi,
> >
> > I just reinstalled my GUS PnP after upgrading it to 8MB. But there is
> > really a lot of hissing (on PCM devices) compared to my Awe64. Is it my
> > setup or is the Awe64 (Gold) just better??? I also have to set master and
> > pcm between 90 and 100% to get at the same level as the Gold (which makes
> > hissing even more of a problem)... 
> 
> I have a GUS PnP and an AWE64 value. I think that I get better sound
> out of my GUS rather than my AWE. The hissng could be because of the IW
> bug which causes a lot of noise on the PCM devices and which is caused by
> too loud PCM data (?). Reset seems to be the only guaranteed way of 
> getting rid of the hissing once it's there. I usually have everything set
> to 0 dB. I have routed the AWE trough the GUS because AWE's inputs seem to
> cause a lot of noise.

Is that noise present only on the right channel? as I've _never_ got _any_
noticable hissing on the left channel but I've often get _BAD_ hissing on
the right channel... by default (amixer -r) my gus pnp's are set to
Master          75 % (  0.00dB) : 75 % (  0.00dB)
Synth           75 % (  0.00dB) : 75 % (  0.00dB)
PCM             100% (  0.00dB) : 100% (  0.00dB)
PCM 1           100% (  0.00dB) : 100% (  0.00dB)
Line-In         0  % (-34.50dB) : 0  % (-34.50dB) Mute
MIC             0  % (-45.00dB) : 0  % (-45.00dB) Mute
CD              75 % (  0.00dB) : 75 % (  0.00dB)
Record-Gain     0  % (  0.00dB) : 0  % (  0.00dB) Mute
Loopback        0  % (-94.50dB) : 0  % (-94.50dB) Mute
... and I've seen this bug with _every_ of the Linux sound drivers I've tried...
triggered by premature closure of the sound device (aka killing the sound player prog;)
... btw this has been bugging me for several years :(


