I found this visual explanation about Binary masking:
So my guess, applied to sound synthesis:
By manipulating bits, we could mask/replace/switch some parts of a waveform to create or alter another one.
Thus the schematic printed on the device, with the 2048 values.
For example a sine could be cutted in half and the end replaced by a square. Obviously it could be really more complicated than that and create really complex signal. (I guess this would be really noisy) (yummy)
It may could even be applied to audio samples and not just single waveforms.
As I’m used to work closely with programmers I can assure you based on my previous experience that there is a lot of chances that I’m 100% wrong