Please visit the updated Roland CR-8000 pages at the new GumiElectronic site.
| CR8000 Bass Drum Decay Mod - I added this to the orginal bass drum circuit. Those familar with the TR606 mods will notice the similarity to Geoff Waterson's 606 BD decay mod. You can experiment with the component values (especially the .047uF cap and 33k resistor) to get different results. I selected a 33k resistor because it juuuust begins to self-oscillate at the high end of the pot, which might not be desirable for everyone. |
| CR8000 VG Board Schematic - Here's a "corrected" version of the original voice board schematic. It was a bit of a pain scrolling around in the service manual pdf, so I pasted the two pages together and aligned everything to make a hardcopy reference for the bench. Some component values are still difficult to read so you might want to check against the PCB before making any mods if you're unsure of the component's location/value. Print it out! |
| CR8000/5000 Service Manual - This might be the most useful service manual I've come across, and the precise labeling of key locations on the voice generator board made the work a breeze. Roland really used to have their shit together. |
| Someone Else's Mods - My experience with this popular U.K. company was disappointing. Twice I asked to buy the documentation on their CR8000 mods and twice they curtly refused, insisting I pay for the entire kit or installation. Eventually I was able to reverse engineer their mods, but in the end, I wasn't that impressed. Many of their pot values make fine tuning difficult, and they missed some components that would have made for better mods, imo. Their MIDI mod also only triggers 11 voices and appears to be non-velocity sensitive. But there is some useful information here. |
| CR8000 Voice Mods by Gumi - Here's a list of all the voice mods I made, complete with PCB locations, replacement component values, and a few notes to boot. There are a lot more possibilities than I've listed here, but these are the ones I ended up wiring. You might want to experiment with different pot and resistor values to get your preferred range. As always, you should assume I've made some mistakes here, so check everything against the service manual and PCB before making your mods. |