This is a manual for the Yamaha DX21 digital programmable algorithm synthesizer. The DX21 uses digital FM tone generation technology to create a wide variety of sounds.
This manual introduces the Yamaha DX21 Digital Programmable Algorithm Synthesizer, describing its FM tone generation, dual voice generators, RAM and ROM memory, performance memories, and MIDI compatibility. It guides users through precautions, installation, audio and MIDI connections, and cassette data storage.
The document is organized into chapters covering setup, playing modes (single, dual, split), performance memory organization, voice programming, MIDI functions, and FCC certification. Detailed diagrams and step‑by‑step instructions help users configure the instrument, program voices, and maintain reliable operation.
| RAM voice memory | 32 locations |
|---|---|
| ROM voice memory | 128 preset voices |
| Performance memories | 32 special memories |
| Audio outputs | 2 (MIX/A and B) |
| Power supply voltage | Matches rear‑panel specification |
| MIDI terminals | IN, OUT, THRU |
The DX21 provides 32 RAM (Random Access Memory) locations for voice storage.
The instrument includes MIDI IN, MIDI OUT, and MIDI THRU terminals for data exchange.
There are two audio outputs, labeled MIX/A and B, for the two tone‑generator channels.