What it is and what it was built for
The Yamaha DX7 II FD Centennial is a 76-key, fully-weighted FM synthesizer released in 1987. It was built for professional keyboard players needing polyphonic FM tones with integrated sequencing and arpeggiation in a stage-ready form.
How it works, in terms a player would use
It uses FM synthesis with six operators per voice. Players edit sounds by adjusting ratios, feedback, and envelope parameters on a single LCD screen. Navigation is menu-driven, with no dedicated knobs or sliders for real-time control.
What it does better than anything else
It does better than most FM synths of its era at delivering a consistent, weighted-key performance feel while retaining full 16-voice polyphony and built-in sequencing in one unit.
What it does badly
It does badly at expressive real-time sound shaping. The interface forces deep menu diving for every parameter change. There are no aftertouch or velocity-sensitive controls beyond the keybed itself. The 64-user preset limit offers no expansion path.
What people made with it
People made music with it using its 64 user presets, built-in sequencer, and arpeggiator — but no source states what specific music, artists, or recordings were made with it.
Who should use it, and who should not
A player who needs a 1987-era FM synth with a piano-weighted action and wants sequencer and arpeggiator functions should use it. Anyone who relies on tactile, immediate sound editing or requires more than 64 user patches should not.
Is it worth your time
It is worth your time only if you need a fully-weighted FM keyboard from 1987 with sequencer and arpeggiator functions — and are prepared to work within its rigid interface and fixed preset count.
