S5551 Rock & Pop
| Manufacturer | Yamaha |
| Function | Accessory |
| Produced | 1990 |
| Country | Japan |
| Form Factor | Part |
| Signal Path | Digital Hardware (including Analog Connections) |
| Notes | SY/TG55 Series D5551-01 data card and W5551 waveform card. 64 patches, 16 multis, 18 waveforms |