Author Archives: grantb4

New MTG Kawai R-50/R-50e to R50iii conversion kit available now.

This is a kit loosely based on the R50iii that was a factory modified/upgraded R50 or R50e.  The factory had the advantage of starting with new blank circuit boards which current R50 owners do not.  Still, this expansion is pretty … Continue reading

Posted in Kawai R100 | Tagged , , , , , , , | Leave a comment

A DX7 Expansion “for the rest of us”

The DX7 E! expansion is known for being very hard to use. The SuperMAX is easier, but still there are so many features that it can be hard to remember them all, … and not everyone needs them.  So I’m … Continue reading

Posted in Yamaha DX7 | 10 Comments

R & D Break Again – until January 2016

Toward the end of every year I take some weeks off to catch up on other things in my life, do some tech/music R & D and force myself to get away from the eBay/Paypal rat race. If you are … Continue reading

Posted in Uncategorized | 1 Comment

CR2032 Battery Holder PCB Saver Adapter (for DX7, etc)

Here is a quick “freebie” of sorts. I’ve had this PCB for a while and used them now and then to fix dead 3v coin cell batteries on Yamaha DX7’s and other synth’s and drum machines. You can order the … Continue reading

Posted in Uncategorized, Yamaha DX7 | Tagged , , , | 1 Comment

Kawai R100 QuadROM (x4) Board

It’s important to have a bunch of unfinished projects on the go 😉 so here is one more on my list. If you recall, I sell a PCB for the Kawaii R100 that has three EPROMs on it. This gives … Continue reading

Posted in Kawai R100 | Tagged , , , , | 4 Comments

Yamaha DX7 ROM Cartridge BINs

I needed to get the BIN data from some DX7 cartridges, but I don’t have them all. I only have ROM3. So I desoldered the EPROM in the ROM 3 and compared that to the .SYX files found easily on … Continue reading

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Yamaha DX7 SuperMAX Redux

Something else I’m working on… The new circuit boards just arrived and the testing so far is good. The boards are a slight improvement over the original: I’ve increased the size to allow for a screw to hold the board … Continue reading

Posted in Yamaha DX7 | 12 Comments

Vintage Synth CPU Updates, Upgrades and Expansions

There are so many CPU upgrades now for our beloved synths of old, that I thought it would be nice to have a catalog of them all in one place. If someone else has done this already, please let me … Continue reading

Posted in Pro One CPU, Uncategorized, Yamaha DX7 | 4 Comments

TurboCPU v1.40 (beta) is available

A new version of the TurboCPU+MIDI firmware has been uploaded to the website, along with a new version of the Windows application TurboCPU.exe. Added: “MIDI Note Priority” which supports 4 modes: Lowest Note, Highest Note, Last Note and my original … Continue reading

Posted in Pro One CPU | 1 Comment

MIDI Patch Change Editor v3.31

Ok folks, I have uploaded v3.31 of the PC editor for the MIDI Patch Changer. There are several bugfixes regarding Preset Navigation and the MIDI Events Editor. As well, by popular demand, a “Cancel” button has been added to the … Continue reading

Posted in MIDI Patch Changer | 4 Comments