Decoding Black Mirror - Bandersnatch Tape Sound

Edit: Another easter egg I've found hiding while opening the tape file with an hex editor is the string "Bigger Digger bigger bee". A quick Google search on it, led me to the Twitter profile of the guy who apparently developed these ZX spectrum programs (he calles himself Gasman). It's his own private easter egg.
He also said there might be more easter eggs coming from Netflix:

"But! There was one last bit of Spectrum material I passed on to the production team that I haven't seen them use up to now. It could just be a mundane "left on the cutting room floor" situation. But there's a chance that we haven't seen the last of this yet..."


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This time I have something really cool to show you :)

Have you seen all the different endings of Black Mirror - Bandersnatch yet? (if your answer was no - go watch now!) 
Did you notice that weird sound at the mid-credits scene coming out of Stefan's tape player? well me too :)

 That weird sound is actually a sound wave of the ZX Spectrum game Stefan developed, and here's his meaning and how to decode it.

If you want to play the tape.tzx I converted, on your own emulator, here's a link for download

Tools I used:

- Audacity - for extracting the sound track
- Python3 + A lib called tzxtools - for converting the sound wave to a tzx tape format
- ZEsarUX - A Windows emulator for ZX Spectrum games, in order to run the tzx tape

Enjoy :)