GumiElectronic

Here is some info on swapping the CR-8000’s voices to different voice groups. This is useful if you’re installing the individual outputs and want certain voices to go to certain outs. For example, if you’ve done the Tom mods, you might want to give them their own output since they now sound so rad. Say […]

The CR-8000 is rather infamous for its faulty buttons. They either don’t work at all or they require multiple presses in order to get a result. The good news is that it’s unlikely that the button is actually broken or needs replacement; it’s more likely that the contacts are dirty and in need of a […]

Installing individual outputs on the CR-8000 has already been well documented by other DIYers. The work requires a little patience but it’s not too difficult. I think Estecho has the best indy out tutorial for the CR-5000/8000. But you can also look at how others have installed indy outs on the TR-606. The process is […]

I’ve received a number of e-mails from DIYers with good questions about my CR-8000 mods. I’ve compiled and answered them below: What are the differences between the Gumi mods and the AS mods? There are too many differences to list here, so the easiest thing to do is cross reference my mods with the AS […]

Here’s a list of all the voice mods I made to my CR-8000, 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 […]

Someone Else’s Mods: My experience with this company was disappointing. Twice I asked to buy the documentation on their CR-8000 mods and twice they curtly refused, insisting I pay for the entire kit or installation service. Eventually I was able to reverse engineer their mods, but in the end, I wasn’t that impressed. Many of […]

Various photos of the Roland CR-8000 modification:

Below is a list of all the features included in my CR-8000 modification: MIDI: • two built-in Elby MIDI2SDS(X) modules • velocity sensitive MIDI triggering of all 14 voices plus accent • trigger mute switch per voice • MIDI learn • trigger pulsewidth control individual voice output groups: • bass drum • snare/rim/clave* • congas […]

Download the CR-8000 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. Download the CR-8000 Owner’s Manual Download the CR-8000 Voice Board Schematic: Here’s a “corrected” […]

Milli-on: The Gumi modified CR-8000 was used in a recent round of studio sketches by Electrodactyl. In addition to the Gumi CR-8000, this track features a Juno 60 and a Sequential Circuits MultiTrak. The cricket sound was produced by velocity programming the Rim Shot. Bench Test: This is the test track I recorded from the […]

Below is my modification of the original CR-8000 bass drum circuit (in blue). Those familiar with the TR-606 mods will notice the similarity to Geoff Waterson’s TR-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 […]