Higher quality dmix resampling

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I get a lot of static-like noise when dmix resamples audio with a USB
DAC I'm trying out.  When I have mpd resample internally with
libsamplerate, it sounds perfect.  Can I get dmix to use libsamplerate
or disable dmix?  One of the main programs I use with audio is miro
which doesn't allow you to specify an audio ouput device.

I tried this in /etc/asound.conf to disable dmix:

pcm.!default {
type hw
card 0
}
ctl.!default {
type hw
card 0
}

and tested with mplayer but that yielded no sound at all.  I also tried this:

defaults.pcm.rate_converter "samplerate"

but that also yielded no sound from mplayer.  Can I get around this static?

- Grant

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