.:Music Technologies Group:.

Parts and information for engineers, musicians and hobbyists

 
* NOTE: I am on hiatus to do R&D until late April. No eBay, etc. *

 

  MTG Pro One
TurboCPU MIDI
SCI Pro One synthesizer
  MIDI Patch
Changer Keypad
MIDI Program Changer Controller
  Synth & Drum
Upgrades
LCD and LED synth upgrades
  EPROM Data
Library
synth eprom upgrade
  Misc Parts
For Sale
synth parts
  Old Projects
& Repairs
synthesizer schematic
 
                       

Community:             ~ forum ~             ~ blog ~             ~ videos ~           ~ facebook ~

* Kawai R100 ROM Switchers and Sound EPROMS *
Killer 12-bit sounds!

Kawai R100 Sound ROM Switcher

 

Kawai R100 EPROM PCB's

Kawai R-100 EPROM 3x Expander Switcher
With ALL 3 R-series EPROMs!

These are new "SoundSwitcher" boards for the Kawai R100. Each board includes copies of all 3 of the Kawai Factory ROMs that were released. (It is my understanding that these are the ROMs for the R100/R50, R50e and a jazz/fusion one.) You get triple the sounds and it's awesome.

Set-by-step instructions with photos are included. Don't miss this chance to fit your R100 with all the sounds made for it. The circuit board is silkscreened with the signal names, so all you circuit benders out there can bend your drum machine without messing with a fine vintage instrument.

Where to buy? Please order off my eBay page

MTG R100 Builder

 

Kawai R100 WAV Files

 

Kawai R100 BIN vs WAVe files

MTG R100 Builder Software
Custom R100 Sounds and BIN Files

MTG R100 Builder BIN file EPROM builder is a free Windows software package that lets you make your own R100 EPROMs. This is companion software for the ROM Switcher (above). If you have an EPROM programmer and eraser you can make your own ROMs or have us burn them for you.

Some of the features of the software are:

  • Simple Project (INI) files can be saved and loaded so that you can easily modify file sets.
  • WAV files are converted into the native compressed format of the R100.
  • Visual indication of EPROM space usage is given.
  • U-Law files from Linn, Oberheim, Sequential and others can be loaded (but resampling them is preferred).
  • Easy to use. No programming or engineering knowledge is required. The user is expected to know how to manipulate audio files and an EPROM programmer is needed to burn the chip (or have MTG do it for you).
  • Original WAV samples from Kawai are included.

Custom EPROMs are available for $20USD each, or if you can burn your own, then the BIN files are $10 USD each. Send in your own sample file(s) or pick one of the files from our library.

The specs for the WAV's are 31,250Hz, 16-bit linear signed PCM data (standard wav, except for the sample rate). If you are using Audacity you can "resample" 44.1KHz clips to 31.25kHz.

Downloads:

  • MTG R100Builder USER manual     (750kB PDF)     v0.30 Beta
  • MTG R100Builder Software     (1,750kB ZIP)     v0.20 Beta

 

* Yamaha DX7 Upgrades & Expansions *
More power, memory and ease-of-use for this legendary FM monster

Yamaha DX7 (original)

Yamaha DX7 backlit LCD backlight

Yamaha DX7 backlit LCD backlight

Yamaha DX7 Backlit LCD Kits

This kit replaces the old non-backlit LCD on a Yamaha DX7 with a beautiful new LCD with long-lasting LED backlight.

  • Everything is included!
  • Easy to install!
  • GREEN Kit = No soldering required, only screwdrivers.
  • BLUE Kit = Soldering required of only one wire. No cuts or jumpers.
  • Uses same Yamaha LCD connector so no hook-up mistakes!!
  • Step-by-step instructions.
  • The back-light is current-limited to protect the DX7 power supply from working too hard.
Where to buy? Please order off my eBay page

Yamaha DX7 SuperMAX

Yamaha DX7 Super MAX

DX7 SuperMAX Expansion!

These legendary (better-than-E!) expansion boards for the DX7 have just landed. They are brand new! If you are interested drop me a line. These as they are like gold. They are $198.85 plus shipping ($5.80 in the USA) and available only by email/Paypal. Here is a brief explanation of the expansion:

  • Memory expansion to 512 voices (16 banks of 32) & great new functions
  • 32 "Factory" sounds utilizing SuperMAX functions
  • 16 note x 1 voice normal polyphonic mode
  • 2 powerful stack modes (8x2 or 4x4) with detuning
  • 4 mode arpeggiator; the most sophisticated ever
  • Custom "Sound Creator" voice functions
  • 3 independently assignable MIDI keyboard zones
  • On-board delays to 9.7seconds, with 15 variable repeats
  • User defined chromatic and fine tuning
  • Compatible with standard RAM and ROM cartridges
Here is my new installation manual.
Here is a link to the abbreviated manual.
And here is a link to a 1988 Keyboard Magazine Review of it.

Yamaha DX7 SER

Yamaha DX7 Special Edition EPROM

This Yamaha Canada SER (Special Edition ROM) replaces the old DX7 oeprating system EPROM and adds a few new features. Special Edition EPROM Manual

  • Function parameters for each Voice can be saved to Internal Memory or a RAM cartridge.
  • Current Master Tune settings are displayed.
  • Expanded MIDI Channel Information features allow you to enable or disable Program and Control changes.
  • Expanded MIDI System Information On/Off features allow transmission of system exclusive data of a single Voice or all 32 Voices contained in Internal Memory.
  • Initialization feature allows initializing Function parameters of a single Voice or all 32 Voices.
  • An enhanced MIDI Receive feature allows selection of Omni mode or any one of the MIDI channels 1 through 16.
  • An enhanced MIDI Transmit feature allows setting to any one of the 16 MIDI channels.
  • Aftertouch On/Off feature. This parameter can now be stored with each individual Voice.
  • An enhanced Main Volume Transmit feature allows tranmission of MIDI volume data by utilizing the Volume jack with a FC7 Foot Pedal. This parameter can be stored to each voice.

I also have the regular OS EPROMs v1.7 and v1.8 (these fix various OS bugs) and other great chips on my EPROM page. These can be ordered by email/paypal.

 

* No Longer Available *
My source of reasonable parts has dried up

Yamaha DX7 (original)

Yamaha DX7 7-segment color LEDs

Yamaha DX7 7-segment LEDs

Yamaha DX7 7-segment color LEDs blue

Yamaha DX7 7-segment LEDs Kit

This kit replaces the old red (dim) 7-segment LEDs on a Yamaha DX7 with bright new white ones.

These are impossible to find elsewhere (I know -- it's taken me months to track ones down that will work)!!

  • Includes two single-digit, 7-segment, bright white LEDs.
  • Uses "roscolux" or "leefilters" colored gels/filters to set the color you want (I will include a couple of good samples!).
  • Step-by-step instructions included.
  • The old ones must be unsoldered and the new ones soldered in place -- requires some experience with soldering.

I also have the DX7 Special Edition EPROM as well as regular OS EPROMs v1.7 and v1.8 (these fix various OS bugs) and other great chips on my EPROM page. These can be ordered by email.

Yamaha TX7

Yamaha TX7 backlit LCD backlight

Yamaha TX7 backlit LCD backlight

Yamaha TX7 Backlit LCD Kit

This kit replaces the old non-backlit LCD on a Yamaha TX7 with a beautiful new LCD with long-lasting LED backlight.

  • Everything is included!
  • Easy to install!
  • No soldering required, only screwdrivers.
  • Uses same Yamaha LCD connector so no hook-up mistakes!!
  • Step-by-step instructions.
  • The back-light is current-limited to protect the TX7 power supply from working too hard.

I also have the TX7 OS EPROM v1.4 (fixes various OS bugs) and other great chips on my EPROM page. These can be ordered by email/paypal.

Yamaha RX15 drum machine

Yamaha RX15 backlit LCD backlight

Yamaha RX15 Backlit LCD Kit

This kit replaces the old non-backlit LCD on a Yamaha RX15 with a beautiful new LCD with long-lasting LED backlight.

  • Everything is included!
  • Easy to install!
  • No soldering required, only screwdrivers.
  • Uses same Yamaha LCD connector so no hook-up mistakes!!
  • Step-by-step instructions.
  • The back-light is current-limited to protect the RX15 power supply from working too hard.

I also have the RX15 OS EPROMs "ver1.1 '84.05.24" and "ver1.1 '84.11.01" (fix various OS bugs) and other great chips on my EPROM page. These can be ordered by email/paypal.

Yamaha DX100 synth


Yamaha dx100 backlit LCD backlight

Yamaha DX100 Backlit LCD

This not really a kit but really more of a DIY project. The TX7 LCD I sell (but without connector) can be used in a DX100. Soldering and plastic cutting with wire snippers required. Also you need to reinstall the old LED or a new one using wires. In a nutshell:

  • Open the case and fold over the main PCB. Unscrew the old LCD.
  • Snip out all the old LCD plastic as flush with the front panel as you can.
  • Remove and desolder the connector from the old LCD and install on the new one. The old VSS pin attaches to pin 1 on the new LCD.
  • Glue the new LCD in with RTV silicone (not hot glue or crazy glue).
  • After drying, wire in the old or new LED with wires from the PCB.

 

* Older Projects *
Photo
Description
Lexicon MRC v4 Blue LCD Lexicon MRC blue LCD. We all know how bad the E.L. backlit LCDs get over the years. The MRC has to be one of the worst. Click. The nice blue color scheme unfortunately filters the LCD brightness a lot too. So these are two photos of a new LED back-lit blue LCD. It was hard to get the exposure right, so I shot two photos instead. Excuse my poor photography skills. This one was a big challenge because of the goofy 74HCTLS logic chips used. The old LCD didn't mind the glitches on the interface, but the modern LCDs sure do. I had to swap out some of the logic to make it work. Anyway looks great!

This is a terribly under-rated MIDI control surface. It's super powerful and compact. I also have v2 and v4 EPROMs for the MRC if anyone needs them burned (see my EPROM page). I am looking for v3.x if anyone has them for sale or trade.

Emu PX-7 Emu PX-7 blue LCD for a customer. The customer supplied the LCD, I just had to tweak the LED current limit circuit and built a suitable cable. Looks very nice.

 

 

Pro One Sequential Circuits Pro One synthesizer modification to change the old red LED to a new blue one. This is very easy to do. Note the flat edge on the LED when you put the new one in place of the old. You should probably change the resistor to a higher value too, or else the newer higher efficiency LED will blind you.

See also: http://www.youtube.com/watch?v=2VeTU_nrSwU

 

DX27 LCD LCD on a Yamaha DX27 synth This synth was a complete refurb. When I got it (insurance write off?) people told me to wear a mask when working on it. It was better than new when I was done.

 

MX-8 LCD This one was actually a bit of a nightmare. There were a lot of devices made in the 80's and 90's with EL backlit (electroluminescent) LCDs. The EL panels burn out after while and the LCDs become unreadable. In this case the pretty blue LCDs are too thick to fit within the depth of the MX8 subpanel so it means you have to machine or nibble out a huge chunk of the aluminum sub chassis. It sure looks good though.

 

RX15 LCD RX15 LCD: For some reason Yamaha cheaped out in the early 80's and didn't use back-lit LCDs. They are pretty hard to use on a dark stage but they can all be updated.

 

TX7 LCD Yamaha TX7 LCD: Once more with feeling. Same LCD, better photograph.

 

 

   
MIDI Bass Pro
owners manual
PDF

I got the OM from 360 Systems for the MIDI Bass Pro and have OCR'd it and added bookmarks. You're welcome. I'm still looking for a user manual and schematics for the original (non-pro) version. Please help.

 

gray line Contact information
grant[at]musictechnologiesgroup.com
Orange County, CA   USA
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