EF-303
| Manufacturer | Roland |
| Function | Effect (Groove Effects) |
| Produced | 1999 |
| Country | Japan |
| Model ID | Ef-303 |
| Form Factor | Portable |
| Signal Path | Digital Hardware (including Analog Connections) |
| Dimensions | 303 (w) x 235 (h) x 92,5 (d) mm |
| Weight | 1.950 |
| Power | 9v |
| Frequency Response | 100mA |
| Notes | Dj-oriented machine with step value modulations inspired from analog sequencer. The EF303 also includes a VA digital drum machine and a TB -303 emulation. |