DX9/7 is an alternative firmware ROM for the Yamaha DX9 synthesizer that turns it into a 6-operator, DX7 compatible synth.
Here’s what the developer has to say about it:
“Its aim is to uplift the DX9’s functionality to more closely match that of the DX7. It restores features that were intentionally restricted in the firmware, such as increasing the operator count to six, and adding a pitch envelope generator. This ROM makes the synth properly patch-compatible with the DX7.
This is not a patch for the existing DX9 firmware, it is an entirely new firmware ROM. It has been assembled from the original binary, together with code from the DX7’s V1.8 ROM, as well as new code written from scratch.”
- Makes the DX9 able to play DX7 patches.
- Restores the use of all six operators.
- The synth is now sensitive to the velocity of incoming MIDI notes.
- Implements the DX7’s pitch EG.
- Implements DX7 style operator scaling.
- Implements DX7 style portamento/glissando.
Note: The new firmware doesn’t turn the DX9 into a DX7, because some DX7 parameters have no equivalent controls on the DX9. The developer also describes the firmware as “highly experimental”.
If you’re hardcore and like the idea of getting a DX7 for a quarter of the price, check out the project out at Github. If you’re not that hardcore and like the idea of a reliable synth, the stock DX9 sounds great and is still one of the best 4-op FM synths ever made.