DCP Productions Motif XS Owner's Manual page 56

The AKS Synthi A (without controller keyboard).
F16 – Sequential Pro-One
The Sequential Circuits Pro-One was a monophonic synth based
on the same circuitry as the Prophet 5. In fact it really was a
monophonic Prophet 5. Plus, it had a very cool arpeggiator. The spirit
of the Pro-One carries on today in the form of the Dave Smith