Steinberg PROteus – Boxed w/ Manual & Security Key, Original & Backup Disks – Excellent

This Steinberg PROteus for Atari ST is in excellent shape, complete with original retail packaging, manual, security key, and both original floppy disks and verified backup copies. The inclusion of the security key and retail box confirms authenticity and original purchase.

PROteus is a professional-grade voice editing and sound module utility tailored for E-mu synthesizers, designed for deep integration with the Atari ST platform. Ideal for vintage MIDI sequencing and sound design, it remains a rare and fully operational tool for studio restoration or collection.