It is not dificult to setup, provided that the usb device is supported by alsa/kernel. The latency depends greatly of the device cpu, kernel, driver etc. Low latencies like 4 ms seems to me hard to achieve.  

No dia 1 de Nov de 2011 13:07, "i go bananas" <hard.off@gmail.com> escreveu:
Hi Ricardo,

this is very encouraging news!

i don't need any externals, just basic pd.  LibPd sounds like it would be ideal.

when you say about using beagelboard with an external audio device, is that hard to set up?

What is the latency like?  i think i really need less than 20ms, but as low as possible is best.