MPG-70 firmware 3.x is now available for download!
MPG-50 mkII Programmer for Roland Alpha Juno 1 & 2 and MKS-50

MPG-50 mkII Programmer for Roland Alpha Juno 1 & 2 and MKS-50

Regular price $555.00 Sale

May 21, 2024 - In Stock

 Latest firmware versions:

 MPG-50 mkI & mkII 3.06-3.07 Firmware Update (March 10th, 2022)  This zip file contains the latest vesrion for mkI units and mkII units.  MkI users should select the detent/non-detent based on which type of encoder their unit has.  If encoder clicks when turned, use 'detent'.  If not, use 'non-detent' version.

Espen Kraft Preset Bank 1 (In Retroaktiv format. )

Espen Kraft Preset Bank 2  (In Retroaktiv format)

User's Manual V1.35+ (Latest edition for mk1 perating systems below 3.x) 

 User's Manual V3.0 for MK1 and MK2 Units running OS 3.x

Setting Up Retroaktiv Controllers In Your Rig


Retroaktiv MPG-50 mkII  is a fully featured MIDI programmer for the popular Roland Alpha Juno 1 and 2, and the MKS-50 rackmount synthesizer.  The MPG-50 is a compact 370mm (14.5") x 149mm (6") x 40mm (1.5").   It features 37 sliders and knobs which control all of the features included on the original PG-300 plus more.   The unit is housed in a high-quality rugged powder-coated metal enclosure.  

MPG-50 mk2 is more than just a controller.  Here's what else it can do:

  • Translates CC to Juno sysex, and transmits CC and SYSEX in any combination.  Full CC automation of all parameters.
  • Poly-chain mode turns 2 Alpha Juno/MKS into a DUAL layered stack (Like a 2-tone synths such as MKS70 or MKS80) that can be stored on the MPG-50 as a SETUP, allowing for lush, layered sounds at the push of a button.
  • On-board patch storage.  Stock MPG-50 mk2 units ship with 32k of memory on-board.  This can be expanded to 160k by choosing the 128k memory expander option.  Stock mk2 units can store 4 banks of patches + 20 ASSIGN + 20 SETUP + 20 CC Maps.  Expanded mk2 units can store 12 banks of 64 patches,  2 banks of 64 ASSIGN, 2 banks of 64 SETUP, and 1 bank of 64 CC Maps.  
  • Daisy chain 2 AJ/MKS-50 to create a 12-voice "Super Juno".  Store "Super Juno" sounds as a single SETUP.  
  • 3rd MIDI IN/OUT port allows users to configure MIDI connections to suit their needs.  This port can be a MIDI IN or an OUT.  
  • Controls 2 Alpha Juno/MKS-50 from one unit
  • Intelligent patch generator creates pads, drums, basses, synths, strings, brass, and more with the touch of a button.
  • Operating system is always being updated with new features.  OS updates are done using a simple MIDI file!
  • Access to all patch menu parameters (MKS50) and ability to select programs.
  • Create user CC maps to use MPG-50 as a generic controller.
  • Assignable mod matrix allows users to control multiple parameters with one slider for expressive effects.  Also allows expression pedal, mod wheel, aftertouch, and breath control of any Alpha Juno parameters.
  • Init patch generator and "manual mode"
  • Crossfade between 2 Alpha/Junos
  • MIDI data filtering
  • High quality metal case.  Sliders have dust covers.  Durable rubber feet.
  • Chord Mode
  • Midi data filter.  Individual toggles to filter note, mod wheel, prog change, pitch bend, aftertouch.

See the MPG-50 in action in the videos below!






 Retroaktiv is based in the United States.  We ship worldwide using UPS.  Note that purchases made from outside of the US may be subject to your country's VAT, customs, tariffs, or sales taxes.  We do not have anything to do with these fees.  They are assessed and charged by customs in your country.  When checking out, all shipping charges are for shipping transit only, and do not include any customs fees.