About the version numbering Aglaophone is still in pre-release. Versions are numbered by date. You can also use pre-existing modules as examples. It usually adds unneeded complexity and makes porting difficult because of differences between compilers. The upper part of the display shows the real time spectrogram, with time on the horizontal axis and frequency on the vertical axis.
Color corresponds to amplitude at the corresponding time and frequency.
The bottom of the spectrogram display corresponds to zero frequency. The black vertical bar through the spectrogram display shows where sound is currently being recorded. The lower part of the display is a real-time oscilloscope showing the actual samples of the signal being recorded. The bottom display is an x4 oversampled and step-filtered version of the audio data from the upper display. You can see the 'step' type interpolation in the time domain by looking at the lower oscilloscope display.