[linux-usb] [UAC2] How to route pcm stream for UAC2 virtual sound card for lowest latency?

[Xuebing Wang <xbing6@xxxxxxxxx>]

Hi Community,

I am developing a commercial product based on Freescale iMX6SL + UAC2.

I can get UAC2 working for below command. 'hw:1,0' is the virtual sound 
card. 'hw:0,0' is the physical sound card.
export RATE=44100; arecord -D hw:1,0 -c 2 -r $RATE -f S16_LE | aplay -c 
2 -r $RATE -f S16_LE &

Any suggestions on what is the best way to get PCM stream from UAC2 
virtual sound card and feed to the physical sound card, for the lowest 
latency purpose?

Thanks.

--
Xuebing
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