The original tapes were sampled and collected by members of zx-pk.ru
The sampled data was digitally analyzed and reconstructed by Ivanq and Manwe. Every wave period now has a square shape, constant integer length and fixed amplitude.
The sample rate is adjusted to match CPU speed of the real БК 0010 computer and tuned to achieve the maximum possible loading speed for particular loader, used in the particular game. In additional, WAV files has small size and can be packed to a very tiny archive.