Not sure on this, but this illustrates the "next steps" to push things forward:

. Smaller file size

. Mp3

. And as you say "hidden " sounds

. Maybe even sounds that are out of range for human hearing

I don't know what use case might be there, but thus is how we push things forward

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Maybe if you first rendered the token as a qr with built in fault tolerance and then turned the qr pixels scanline into sound. Just making shit up

I have no idea what you just said! Lost me at qr pixels...sound. 😀

21x21 pixels in this qr.