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Please do. Last time that i checked, all the links on the japanese site were no longer working.

btw, the parts on mine is exactly the same as on the japanese schematic.

Moi?   Ill try to check my github soon.  apparently there is at least one other error with the stuff i posted.

try denatured or rubbing alcohol.    Simple Green is also effective at removing paint.

if the scratches arent deep, perhaps they can be buffed out.    Try to find  some kind of glass polishing product ( maybe at an auto store, for windshields ), a soft cloth and some patience.

I dont even know where to begin...
I think that you'd be better off by building the YM/arduino synth as-is (using a standard midi keyboard for testing); then build a  midi controller  w/ the toy keyboard and using a separate arduino .   Then when both are working, you can attempt to merge the two the sketches to run on on a single arduino.... but by then you might realize that there is no need-   even the cheapest midi controller will have a better keybed than the CVS toy.

I plan to

oh, btw.... I designed/built a hardware knobby controller for the YM2151, but Ive been lazy with the documentation


It uses a teensy 2.0.  All parameters have a pot or switch.  (w/ an extra in the bottom right corner... hoping for glide eventually)
Some features:
  *DIN IN and USB Midi IN/OUT
  *(More or less) Euro Rack sized.   As is, can be squeezed  into a rack if the mount tabs are thin.   Ill try to shave it down a little in future revisions
  *Assignable velocity (and eventually aftertouch) 
  *OLED Screen to display Alogorithm, LFO wave, preset #, midi channel, velocity destinations, etc
  *can store over 255 presets. Im using an adafruit FRAM breakout w/ 32K of nonvolotile memory and over a rillion write cycles.
  *...and  can load and save patches for Masl's Java based Controller App.  (Would be cool to get them talking both ways- being able to upload       
    patches from the hardware editor to the software one, functioning as a patch editor.)

Right now it is just a DIY er.   The boards are home etch-able,  However there is some surface mounted components.    The entire circuit is composed of 7 different boards, 6 of which have a SOP mux chip.    (Thinking of just using the actual FRAM chip instead of the adafruit breakout, so ultimately there will be a 7th surfave mounted part.) Not 'hard' , but maybe not for the novice.   Ill post the layouts and code on github eventually.   ...perhaps consider making/ offering boards in kit form where the all the surface mount stuff is already done

parts are about $100