Install USB sound card driver

Install software:

opkg update
opkg install alsa-utils 
aplay -t  wav  -f dat   some.wav
-f cd (16 bit little endian, 44100, stereo)
-f cdr (16 bit big endian, 44100, stereo)
-f dat (16 bit little endian, 48000, stereo)
wget http://learn.parallax.com/sites/default/files/content/propeller-c-tutorials/simple-devices/Play%20WAV/techloop.wav
aplay techloop.wav