Sun Aug 18 16:27:12 EDT 2013

Adding application interface

In usb-generic-serial.ss : just add a second interface?

So usbserial will make additional bulk endpoints into /dev/ttyXXX.
Not what we want.

Probably this needs a proper ACM interface, so it can coexist with the
other interfaces.

- fix the interface definition DSL
- ADC modem interface
- MIDI interface