JX-305
| Brand | Roland |
| Function | Synthesizer, Sequencer, Drum Machine |
| Country | Japan |
| Form Factor | Keyboard |
| Signal Path | Digital Hardware (including Analog Connections) |
| Dimensions | 1011 mm (w) x 83 mm (h) x 289 mm (d) |
| Weight | 6.9 kg |
| Power | AC Adaptor DC 9 V 450ma |
| Parts | 24 (8 main, 16 RPS) |
| Memory Capacity Patches | Internal 640, User 128 |
| Memory Capacity Rhythm Sets | Internal 28 |
| Memory Capacity Patterns | Internal 268, User 256, RPS 500, opt. 2MB-card 200 (max.) |
| Effects | Reverb (2 types), Delay (6 types), Multi-Effects (24 types) |
| Channels | 64 Voice |