DX9

Back in 1983, this synth arrived as Yamaha's more approachable entry into FM synthesis, sharing the DX7's iconic shell but packing a simpler 4-operator engine that still delivers those signature metallic timbres without the full complexity.

At its core, it runs digital FM synthesis with 4 operators across 8 algorithms, each with dedicated 4-stage envelopes, a pitch envelope, and an LFO offering saw, square, triangle, sine, and random waves. You'll find a 61-key non-velocity-sensitive keyboard, modulation and pitch wheels, plus ports for breath controller, footswitch, and MIDI In/Out/Thru for integration. It holds 20 user patches in internal memory, saves to cassette tape, and outputs via stereo audio jacks with a headphone out—all in a sturdy 40x13x4-inch frame weighing about 27 pounds.

Over the years, players appreciate its gritty 12-bit sound and straightforward editing for bells, basses, and pads, though some note the lack of velocity and cartridge slot as limitations compared to siblings. It's a charming vintage piece that rewards hands-on tweaking.