Synth Firmware Shop

Re-engineered firmware for certain vintage synths, developed by Bob Grieb ( – sold with permission and including a license fee to the author for each and every chip. (So you are supporting a brilliant engineer and his love for vintage sound machinery.)

Firmware Upgrades for:


Crumar Bit One Tauntek Firmware Upgrade Kit CC-enabled

Item number: 0011
Item price: 53,00 EUR
(incl. 19,00% sales tax and plus Shipping cost)
Bit One Firmware
For CEM chip-based version only, please check before ordering whether you have CEM or SSM filter chips inside your BIT


Tauntek JX-3P Firmware Update

Item number: 13
Item price: 31,50 EUR
(incl. 19,00% sales tax and plus Shipping cost)
Tauntek JX-3P Update

Chip with Tauntek firmware upgrade for Roland JX-3P. Needs hardware patch to work.

MIDI CC control and other functions - (C) 2021 Bob Grieb/ Sold with permission and on behalf of the author.


Tauntek MKS-30 Firmware Update Chip

Item number: 14
Item price: 31,50 EUR
(incl. 19,00% sales tax and plus Shipping cost)
MKS-30 Firmware


Prophet 5 V 3.3 Firmware Update

Item number: 15
Item price: 80,00 EUR
(incl. 19,00% sales tax and plus Shipping cost)
Tauntek Firmware Update for Prophet 5 V 3.3. (w/ original SCI-MIDI-Board only)

OB-8 Upgrade Kit

OB-8 Upgrade Kit

Item number: 16
Item price: 110,00 EUR
(incl. 19,00% sales tax and plus Shipping cost)

Firmware update for the Oberheim OB-8 synthesizer, 5x EPROM 27C32

Firmware update for the Oberheim OB-8 synthesizer. New features:
  • MIDI CC support for controlling all patch parameters. (Does not work in Manual mode)
  • Four different MIDI Sysex dumps can be transmitted in page 2:
    • Currently loaded patch (same as B5);
    • all 120 patches, sent as 120 sysex packets;
    • saved splits and doubles, sent as one sysex packet;
    • saved envelope offset calibration settings, sent as one sysex packet
  • Non-volatile storage of MIDI channel setting and MIDI mode
  • MIDI clocking of the arpeggiator is now possible, notes can be configured as half, quarter, eighth, or sixteenth notes
  • A very subtle bug in the B5 firmware was discovered, and fixed. This can cause the OB-8 to crash (lock up) at seemingly random times if you pound it with MIDI messages, for example by sending it tons of MIDI clock messages every second. (Of course the B5 firmware doesn't support MIDI clocking, so there would be no reason to do this)
Please note that this firmware needs the original OB-8 MIDI board from Oberheim to operate; it will not work with the Encore MIDI interface. Please get in contact with us before ordering as we will have to hunt for NOS EPROM chips first.
5x EPROM chip 27C32 with the firmware

See our terms of business und refund policy. The shop is an enterprise of Ingenieurbüro Günther Eggers, see the contact page.