I've still got my E-mu Proteus MPS, purchased new back in the mid 90s (staff discount as I worked for Creative Labs who owned E-mu by that time). Over 20 years later and it still works perfectly. Different demo medley than the rack module, but to anyone that's owned a Proteus, unmistakable.
I purchased an used Proteus/1 and it works great midied to my Korg Krome for great Hammond B3 emulation playing Gospel Quartet. Stay Safe and Blessed 🎹🎤🎵🎶🎼🎼🎶🎵🎵🎵🎶🎼✝️🙏🏿😎💯💯💯
if you have the protologic add-on inside the proteus 1 - then there is no demo-song function anymore. it only works with original and unchanged proteus 1.