PG-800 MINI DIY Kit for JX-8P & Super JX (Internal Installation, not assembled)

PG-800 MINI DIY Kit for JX-8P & Super JX (Internal Installation, not assembled)

Regular price $180.00 Sale

September 6th, 2019 - 1 kit left.  The DIY kit is going to be discontinued when sold out.  Partially assembled kits will be available in late September.  Fully unassembled kits will no longer be offered when sold out. 




The PG-800 Mini is a compact controller for the Roland JX-8P,  and Super JX synthesizers.  It has all of the functions of the original PG-800, plus some new features.  The PG-800 Mini fits perfectly inside the chassis of JX-8P and Super JX synthesizers, measuring just 7.75" x 4.25" x 1.25".   The controller is also compatible with Super JX synths which have the Vecoven upgrades.    The Mini can now also operate in "Vecoven 4.x mode", which adds a Page 2 button, giving hands on control over all of the 40 extra tone parameters in Vecoven 4.x firmware.   The kit is available in 2 configurations:

Full Kit - Includes everything you need build the controller and install into your JX8P or Super JX front panel.  Includes PCB, processor, 44 pots, 2 switches, all SMD parts, connector wire, hardware, front panel, drill guide. ($210)

Partial Kit - Includes PCB, processor, 44 pots, hardware, connector wire, hardware, front panel, drill guide.  Includes no SMD parts, switches, or switch caps.  Those can be ordered using the Mouser carts included in the User Manual & Build Guide.  ($180)



MuffWiggler Build Thread (With photo guide to installing in JX-8P)

User & Installation Manual Download  

 Firmware update for early units purchased before 9/15/2017 (Through hole processor only)  Firmware updating process is detailed on the Muff Wiggler thread above.  

Schematics and BOM for all PCBs that have a through-hole Atmega48 processor:

Schematic (Oct 2017) * Parts change - Use 47uF for all polarized caps except C13, C42.

Latest BOM (1/10/2018)

REV 2.0 Firmware Update (.BIN file)  

Vecoven PWM Page 2 Parameter Chart

Schematics and BOM for all PG-800M kits that have SMD TQFP-32 processors are below.  All boards bought from Retroaktiv after 1/1/2018 are this type. 

Rev 2 PCB w/ SMD Processor Schematic Diagram (March 10, 2018)

Rev 2 PCB w/SMD Processor BOM (March 10, 2018)

The PG-800 Mini features some useful functions that the original PG-800 did not have.  New functions include:

"Scratch patch" generator - Tapping a button will generate a basic scratch program, which serves as a useful starting point when creating a new tone.  

Random patch generator -  Holding a button down will generate a random tone.  This is a fun way to discover new sounds from the JX.

Copy & paste - Copy the current state of the knobs on the PG-800 Mini to save your ideas or easily transfer a tone to another program.

 Output Disable Mode - Allows the PG800 Mini to stop transmitting messages to the synth.  This is useful in performances, where inadvertent touching of a knob can transmit unwanted messages.

Page 2 - Booting up in "Vecoven 4.x" mode will turn the WRITE button into a Page 2 function.  All 40 extra tone parameters can be controlled using this function.  Parameters include all PWM, LFO2, ENV1-4, LFO sync, upper/lower balance, aftertouch vibrato amount, aftertouch VCF amount, and aftertouch volume amount.  A total of 88 parameters can be controlled with the PG-800 Mini and a Vecoven upgraded JX.  Page 2 parameters are shown below:

Firmware updates will be made available if and when new features are added to the software.  

 This kit requires SMD soldering.  The smallest part used is  0603 caps and resistors.  Board connects to the JX via 5 wires.  This should be installed by people with electronics experience.  Drilling into your synth is permanent.  Be sure to do a good job and follow the instructions closely. 

If you do not have SMD soldering equipment and knowledge of that, it is best to purchase assembled & tested boards from us.