[LAU] ALSA: always use samplerate_best

[Grant]

I have a USB DAC that can only handle 16/44.1 as input and output. I
think ALSA will resample everything to 16/44.1 automatically, but I'd
like that to happen with the highest quality resampler which I think
is samplerate_best. I use xfce4 and I don't want to install
pulseaudio. I've added the following to /etc/asound.conf:

defaults.pcm.rate_converter "samplerate_best"

Should that do it? How can I verify that it's working?

- Grant