I just saw this: http://hackaday.com/2014/07/22/talking-beagleboard-with-jason-kridner/
It's a 14-channel 100Msps logic analyzer using the BeagleBone Black and no additional hardware - it makes use of the on-chip dual programmable real-time units (PRUs).
Apparently it has been used to capture sustained >100MByte sized data streams : ) And also for I2S audio data capture : ) It would be ideal for digital audio testing!
Highly impressive stuff.
The BBB has evolved into the universal test tool that we always suspected it could become.
