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Kawai R-100

477′s Kawai R-100 Project

September 23rd, 2012 by gumi | No Comments

477′s Kawai R-100 Project

Some weeks or months or years ago 477 contacted me with questions about bending his R-100. He recently finished the project and the result is gorgeous. He installed the U24 and U40 bends opting for a built-in patchbay as opposed to a breakout box or toggles. All 12 pins of U40 are patchable. 477 (aka […]


Kawai R-100 Factory Reset

January 16th, 2011 by gumi | 4 Comments

Kawai R-100 Factory Reset

If your R-100 is suddenly confused and misbehaving, the factory reset procedures might knock the sense back into it. I found this info in this circuitbenders thread. It was originally written in French. Here is my translation with help from Google Translator: “To initialize the parameters only: hold down the [ERASE] button while you turn […]


Kawai R-100 ROM Switcher

June 16th, 2010 by gumi | 2 Comments

Kawai R-100 ROM Switcher

Here are a couple pics of the ROM switcher that came installed in my R-100. Apparently there were different versions of these boards, as seen on the Burnkit2600 R-100 page. Mine is labeled as an R-50 Soundswitcher by Drumware Inc. and it has an additional 2-4 Line Decoder IC, but I’m not sure what purpose […]


Kawai R-100 CP-2 & CP-3 ROM Voices

June 16th, 2010 by gumi | 2 Comments

Kawai R-100 CP-2 & CP-3 ROM Voices

Here are the voices of CP-2 and CP-3 (optional R-100 voice ROMs) with their respective pad assignments. CP-2 Pad 1: Atomic Kick/Room Kick/Acoustic Kick Pad 2: Atomic Snare/Room Snare/Acoustic Snare Pad 3: Electronic Tom Hi/Purple Rim Shot/Click Pad 4: Electronic Tom Mid/Claps/Funk Bass Pad 5: Electronic Tom Low/Mellow Bass/Electronic Snare Pad 6: Closed Hi-Hat/Open Hi-Hat/Tympani […]


Kawai R-100 Audio Demos

June 13th, 2010 by gumi | 2 Comments

Kawai R-100 Audio Demos

Here are five demos of the new & expanded Kawai R-100 bends. The recordings were made using an R-100 with all three voice ROMs. What you hear is straight from the individual outs and new synth out. I will post documentation later. I Would Eat Insects: Features ROM bends, DAC bends, pitch modulation, and synth […]


Kawai R-100 U40 DAC Bends

June 13th, 2010 by gumi | 1 Comment

Kawai R-100 U40 DAC Bends

You can get a variety of nasty distortion/bit reduction effects by connecting pins 1–12 on U40, which is the R-100′s DAC chip. I tested all 12 pins, but I only ended up wiring pins 1–8 to a bank of switches on the R-100′s front panel. These bends turn the R-100 into a very dirty beast.


Kawai R-100 Circuit Bending Photos

June 10th, 2010 by gumi | No Comments

Kawai R-100 Circuit Bending Photos

Photos of the Kawai R-100 in various stages of bending.


Kawai R-100 Service & Owner’s Manuals

June 10th, 2010 by gumi | 2 Comments

Kawai R-100 Service & Owner’s Manuals

Download the Kawai R-100 Service Manual: It’s certainly not as detailed as some service notes, but it’s enough to get you started. You might want to take a peek at the schematic before doing any mods to U24 (the voice ROM IC). Note that there appear to be some discrepancies between the component numbers shown […]


Kawai R-100: How To Clean the Buttons

June 10th, 2010 by gumi | 3 Comments

Kawai R-100: How To Clean the Buttons

The buttons on my R-100 were rather fussy. Sometimes they required multiple presses and other times they’d trigger several times upon a single press, so it was frustrating to program the machine. But I was able to clean them and now they work like new. Here are the materials I used: • miniature flat-head screw […]


Kawai R-100 U24 Voice ROM Bends

June 9th, 2010 by gumi | 8 Comments

Kawai R-100 U24 Voice ROM Bends

The main R-100 modifications are centered on U24*, which is the voice ROM IC. All you need to do is connect various pins on U24 to get a variety of nasty sounds, everything from rippling ring modulation to crunchy distortion to stuttering delay-like effects. The trick is figuring out which pins can be connected without […]


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