backward compatibility 1b and 1a

[parity-error]

          I have built a custom application around this 

https://github.com/SDRplay/examples/blob/master/play_sdr.c
which works with the rsp1a devices. Just bought an rsp1b in hopes noise floor would be better but the code does not see the rsp1b. It reports
mir_sdr_GetDevices sees 0 devices total.
mir_sdr_GetDevices sees 0 devices available.
I was under the impression that the rsp1b was compatible. Any ideas on what I can do to make my code that works with rsp1a also work with rsp1b? Thanks in advance.

Originally posted by @parity-error in #4 (comment)