After taking delivery of a Rock 5B with 8 Gb RAM, I took the opportunity to check and update all the processes necessary to install the software necessary to run this device. Many of the previous bugs, such as ALSA not being able to record at high frequencies, have now been fixed by those people themselves. The only real problem I had was that the Rock 5B would not boot up on the first, or even the second try and had to be re-powered up several times.

Once the software was all successfully installed, the GUI was used to set the system to graphical display, which displays a bar chart, and on pressing 'Start', everything worked pretty much as expected. What was not expected, was the high quality of the recording, with none of the usual aberrations found with the other devices used. This is a massive advantage and well worth the extra expense of the Rock 5B. Also, the 8 Gb of RAM allows many more species to be detected if I had the audio data and there's even a 16 Gb variant available.

The instructions here and GitHub repo have been updated.