Comment 3 for bug 375993

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Daniel T Chen (crimsun) wrote : Re: low sound quality using dmix

Then your pcm.emudmix definition is a bit skewed. Remember that period_size needs to be a multiple of 2, generally a power of 2.

Also, you really ought to look at an existing template and just modify the necessary bits, e.g., http://package-import.ubuntu.com/a/alsa-lib/jaunty/annotate/head%3A/src/conf/cards/CA0106.conf

Note how CA0106.pcm.default wraps asym.