[AG-TECH] APware running - always or just when needed

Jonathan C. Humfrey jch at cs.ucsb.edu
Mon Mar 18 12:26:09 CST 2002

Thanks Bob, I think we might be.  What is the best way to set up the AEC


On Mon, 18 Mar 2002, Robert Olson wrote:

> At 09:33 AM 3/18/2002 -0800, Jonathan C. Humfrey wrote:
> >We have been experiencing serious wierdness in our XAP 800 where both
> >speakers will be producing very poor quality, static filled sound which is
> >totally unusable.  At that point if we mute one of the two speakers (it
> >changes each time) the other will work well by itself.  Eventually that
> >speaker goes out, we need to mute it and the other comes back on.  Could
> >this have anything to do with the fact that we are running AP Ware all the
> >time?  Does anyone have any knowledge of a problem like this?
> Hm, weird. You might doublecheck the gentner matrix to make sure you are 
> not routing a microphone in put to the output being used as the echo 
> cancellation reference (this can cause some weird effects). You can 
> sometimes tell if this is the case if you tap on the microphone and you 
> hear the tapping on the local speakers - if you haven't configured 
> explicitly for local reinforcement, you shouldn't hear the local audio back.
> If there isn't a matrix setting that looks like it'd cause the problem, but 
> you hear the tapping, your PC card mixer may be looping back. If you have a 
> late-model SB PCI128 or other AC97-compliant card, try this:
>          aumix -l 0
> and see if it helps. If it does, (assuming you're running the opensound.com 
> drivers), you can run
>          /usr/lib/oss/savemixer
> to save the settings for the next reboot.
> --bob

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