I made this block diagram a while ago but it was pretty terrible, so I redrew it tonight and finally got it up.

n the diagram you see that it's very similar to the softrock Rx II (diagram here). Essentially the beaglebone black (BBB) controls the local oscillator frequency, 'superband' filter selection, and reads the raw I/Q values from the ADC. It replaces the requirement for a separate uctrler and soundcard, and should be pretty easy to use through the use of the PRU on the TI chip in the BBB.