DX21 guide
A brief guide to Yamaha's 4-operator range of FM synths. This information applies to the following synths:
Frequency ratios
There are four sets of ratios to choose from. For simple mathematical ratios (doubling, tripling, etc), stick to a single column for a carrier and its modulator. For more complex mathematical ratios (basically unrelated), jump to a different column.
| 1 | √2 | π/2 | √3 |
|---|---|---|---|
| 0.50 | 0.71 | 0.78 | 0.87 |
| 1.00 | 1.41 | 1.57 | 1.73 |
| 2.00 | 2.82 | 3.14 | 3.46 |
| 3.00 | 4.24 | 4.71 | 5.19 |
| 4.00 | 5.65 | 6.28 | 6.92 |
| 5.00 | 7.07 | 7.85 | 8.65 |
| 6.00 | 8.48 | 9.42 | 10.38 |
| 7.00 | 9.89 | 10.99 | 12.11 |
| 8.00 | 11.30 | 12.56 | 13.84 |
| 9.00 | 12.72 | 14.13 | 15.57 |
| 10.00 | 14.10 | 15.70 | 17.30 |
| 11.00 | 15.55 | 17.27 | 19.03 |
| 12.00 | 16.96 | 18.84 | 20.76 |
| 13.00 | 18.37 | 20.41 | 22.49 |
| 14.00 | 19.78 | 21.98 | 24.22 |
| 15.00 | 21.20 | 23.55 | 25.95 |
Electronic music making guides: Aphex Twin guide | Creator guide | DX21 guide | DrumStation guide | MCV-24 guide | MicroVerb III guide | S1000 guide | ST guide
Electronic music making tables: BPM to milliseconds | DX21 guide | Interval | MicroVerb III guide | Pitched tempos | Pitches | S1000 page map | ST MIDI sequencer timeline | Transposing tempos