What it is and what it was built for
A dual-manual analog synthesizer built by stacking two Prophet-5 units. It was made to extend polyphony beyond five voices while preserving the Prophet-5’s hands-on architecture and sound.
How it works, in terms a player would use
It runs two full Prophet-5 signal paths in parallel — each with its own VCOs, filters, and envelopes — controlled from a dual manual. Players dial in one sound per layer, stack them, and play across 122 keys. Auto-tuning resets drift, but requires stopping play to engage.
What it does better than anything else
It delivers unmatched analog polyphonic thickness — ten simultaneous SSM-based voices in Version 1 or 2, layered with zero digital compromise. Nothing else from 1980 offers that density of discrete analog oscillators in one instrument.
What it does badly
Version 1 overheats and detunes mid-performance. All versions are physically unwieldy: heavy, wide, and loud in operation. The CEM-chip versions sacrifice low-end weight for stability — a real loss for bass and pad work.
What people made with it
Composers and artists used it extensively through the 1980s and 1990s for rich pads, layered leads, and cinematic textures — wherever ten-voice analog weight was required.
Who should use it, and who should not
A studio owner with climate control, space, and a technician on call. Not for gigging musicians, beginners, or anyone who prioritises reliability over sonic character.
Is it worth your time
Only if you need ten-voice analog thickness at the cost of size, heat, and maintenance. It does not scale to modern workflows. It demands space, cooling, and tolerance for chip-dependent sonic trade-offs.
