i want one of these

[Vipershark]

Does that mean you could reverse engineer a old Electronic Keyboard to do the same thing?

Idea's they are stirring.

theoretically, yes
though you'd need separate microcontrollers as he did

if I read it right, he didn't repurpose/hack the organ's original music making parts. Instead, he just hooked the keys, switches, jacks, and the speaker up to his microcontrollers. Basically, it isn't so much reverse engineering as it is modding, but whatever.