SY55
| Manufacturer | Yamaha |
| Function | Synthesizer |
| Produced | 1990 |
| Country | Japan |
| Form Factor | Keyboard |
| Signal Path | Digital Hardware (including Analog Connections) |
| Dimensions | 911 mm x 325 mm x 90 mm |
| Weight | 9.7 kg |
| Power | 15 watts |
| Notes | Keyboard: 61 keys with velocity and aftertouch Polyphony: 16 notes Multitimbral: 16 parts Preset Patches: 64 User Patches: 64 Preset Performances: 16 User Performances: 16 Sequencer Memory: 8000 notes |