Yamaha Disklavier

The core interaction is a capture-and-replay loop through a real acoustic mechanism. Fiber-optic sensors measure the movement of keys, hammers, and pedals during a performance; the data is written to a 3.5-inch floppy in E-SEQ format, the proprietary precursor of Standard MIDI Files. On playback, solenoids physically push the keys and pedals, so the piano's own hammers strike its own strings. Early models recorded hammer velocity; later PRO models captured key-up velocity and sub-MIDI-resolution touch, because normal MIDI's 0-127 velocity range could not express a pianist's full dynamic range.

The Disklavier's defining cultural moment came in 1989, when Jean-Claude Risset wrote Duet For One Pianist at the Laboratoire de mécanique et d'acoustique in Marseille. The pianist's notes are algorithmically transformed — mirrored, delayed, arpeggiated — and sent back to the same piano in real time, so the performer duets with a machine that is literally the same instrument being played by the ghost of their own hands. Risset and Simon Bolzinger built the DKompose library for Max/MSP around this idea. Later composers like Kyle Gann (three Disklaviers tuned to microtonal intervals) and Dan Tepfer (Natural Machines) explored the same 'the piano answers you' paradigm.

The Disklavier descends from the pneumatic player piano — the 19th-century instrument that played itself from punched paper rolls — rebuilt with digital sensors and solenoids. Yamaha's later experiments connected Disklaviers over the Internet: in 1997 Ryuichi Sakamoto transmitted a performance to thousands of locations, and the Minnesota International Piano-e-Competition used synchronized Disklavier PROs on two continents so a jury member in Japan could experience a pianist playing live in St. Paul. The mechanical delay between MIDI data and audible hammer strike is about a quarter of a second — a physical latency built into the interface itself.