JD-990 Software / Patches:
Patch Converter JD-800 -> JD-990
Free Patches (61 bank total)
JD-800 Factory Patches (converted to JD-990 format)
SR-JV-04 Vintage Expansion JV patches*
SR-JV-04 Vintage Expansion JD patches
*can be used in any Super JV, XP and XV synthesizer, and in JD990 of course.
Vintage Expansion Patches “Hack”
Well not a hack, more like a work around. If you own JD-990 and a Vintage Expansion then by now you probably know you can not load its patches directly as you do regular presets. Instead you have to initialize the sound, then go to the card selection, etc. To simplify this a bit, in above SYX file titled SR-JV-04 Vintage Expansion JD patches you will find 4 SYX dumps. These originate from the Vintage Card. So now you can simply send them to your JD and have them in normal access mode, since they will occupy User RAM area. Downside is, the hack works for only 64 patches at a time. But, as they say: better something than nothing. Simply write down the patches you like / favour, repeat the same step for other three banks. Then use Patch Organizer (included on this page) to build your own compilation of 64 favourite Vintage Expansion patches.
JD-990 DAC Calibration
A noise can occur during long release times. If this is the case, you will need to calibrate the unit. Noise itself is the result of improperly trimmed DAC (digital / analog converter). Type of the noise we discuss here sounds somehow like a bitcrusher or a bad working noisegate – it’s not the hiss we talk about here. Here’s the procedure:
- Open the top cover of JD-990.
- With the JD turned off, hold down INC + DEC buttons then turn power on.
- This should get you into the test mode.
- Then press UTILTY + F3. This gets you into the MSB Adjustment page.
- Make sure the volume control is at maximum. (Watch out you speakers!)
- Press the value knob, a 440hz sine-wave is produced.
- Use an instrument such as an oscilloscope to observe the output waveform. If you don’t have oscilloscope, you can use headphones and listen carefully with your ears.
- Adjust VR1 to obtain a smooth sine wave.
- The VR1 is located on the main board, top right side of it (if JD is placed with its front side facing you). In fact it is the only trimmer potentiometer there.
JD-990 Factory Reset
Warning: this will delete all of your presets. Please dump them via sys-ex before doing this procedure
- Hold Exit and press Utility.
- Screen says Internal ALL = Factory Preset.
- Press Execute (F6).
- Press YES (F5).