ref: 54a79e5b18c2add939feafb2a3f1128c8b7e4d06 dir: /bin/2mp3/
#!/bin/rc play -o /fd/1 >[2]/dev/null |\ audio/pcmconv -i s16r1c1 -o S16r1c1 |\ audio/mp3enc -r -v -q 0