Juno Alpha


How to run this program.


Run this program from within the Ctrlr program itself. Download a copy of 5.3.201 for Windows/Linux or 5.3.198 for MacOS. and load this program into Ctrlr. This can be done from within a DAW too, by loading this panel into the VST version of Ctrlr, which will have been preinstalled into your VST folder.
  1. Go to :: File » Open Panel


It is also possible to compile and run this program as a separate standalone program or VST/AU .

  1. Open this program from within the Ctrlr program.
  2. Go to :: File » Open Panel
  3. Go to :: Panel » Panel Mode. Change the Canvas Bonds last number of four from 630 to 654※
  4. Then Go to ::  File »  Export » Export Restricted Instance.
  1. Open this program from within the Ctrlr VST/AU program within your DAW.
  2. Go to :: File » Open Panel
  3. Go to :: Panel » Panel Mode. Change the Canvas Bonds last number of four from 630 to 654※
  4. Then Go to ::  File »  Export » Export Restricted Instance.
Pre compiled files are available on SourceForge. Canvas Bounds
※ Workaround/Bug Fix :: To build as standalone executable on Windows or export as VST, please add 24 pixels to the panel height before exporting.. (otherwise you will find the bottom 24 pixels have been truncated).


     If after installing a new version of this program ,
    there are no images visible, or previous version images are showing:
  •  MacOS ※ — delete folder Library/Preferences/Juno Alpha/ and restart program.
  • WINDOWS ※ — delete folder C:\Users\%USERNAME%\AppData\Roaming\Juno Alpha and restart program. @RD /S /Q “C:\Users\%USERNAME%\AppData\Roaming\Juno Alpha”
  • When saving custom cc ⇒ sysex mapping to file under Linux and MacOS be sure to add extension .JUMP to end of filename.
With thanks to Tedjuh for valued input and suggestions. Also thanks to http://llamamusic.com/mks50/
Download Juno Alpha
Downloads :: 130

File Size :: 366.5 KB


Direct Download of Standalone Program (Caution! Download starts without warning)

Download Juno Alpha


  • Download BULK DUMP from Juno to panel.
  • Upload BULK DUMP to Juno.
  • Save BULK DUMP to disk from panel.
  • Load BULK DUMP sysex files from Disk to panel.
  • Load/save single patch files and send to Juno
  • cc ⇒ SYSEX mapping (Use MIDI controller to change values on panel/JUNO)‡
  • VST indexing for automation of most JUNO parameters including MODULATION and PITCH BENDER
  • Visual representation of EG Envelope.
  • Change basic panel button colours, background etc.

CC ⇒ SYSEX Mapping ‡

  1. Ctrlr – Connect your MIDI->Input/Output to the same in/out as on the JUNO.
  2. Ctrlr – Connect MIDI->Controller MIDI to your MIDI Controller keyboard.
  3. On your MIDI Controller keyboard assign a slider/knob to a cc # 0-127
  4. In the Admin area of the panel, switch on cc mapping
  5. Select which control on the panel you want to associate with the CC# you assigned on your hardware controller!


1) Connect MIDI OUT and MIDI IN cables between the Alpha Juno and the computer

2) Set the MEMORY PROTECT SWITCH on the back of the keyboard to the OFF position

3) Press [ MIDI ] and the display will read MIDI CH = #

4) Turn the Alpha-Dial until all of the settings look like this:

       MIDI CHANNEL= 1
       MIDI OMNI   = OFF
       MIDI LOCAL  = ON
       MIDI AFTER  = ON
       MIDI EXCL   = ON
       MIDI HOLD   = ON
       MIDI PROG C = ON
       MIDI PORTA  = ON

5) The BULK DUMP data transfer methods used are different from the
   instructions listed in the Alpha Juno-1/2 Owner's Manual.

   You must press the WRITE key at the same time as the DATA TRANSFER and
   BULK DUMP keys are pressed.  

6) The method for BULK LOAD data transfer used in this
   manner should read in the Alpha Juno-1/2 display window as;
   Bulk Load MIDI.o                       <==== Correct
   as opposed to the normal display of:
   Bulk Load MIDI..                       <==== Incorrect

  * The easiest way is to use these three keys at the same time
  * is to first press the DATA TRANSFER key and then, while still pressing
  * DATA TRANSFER, press the WRITE key and while still pressing these two
  * keys, press the BULK DUMP key or BULK LOAD key.
Running as VST under Cubase
  1. In Cubase, Disable †Midi-in **Midi-out ports to the Synthesizer (Juno Alpha).
  2. Open the Juno Alpha VST in an instrument track IN=(All Midi Inputs)
  3. Create Midi track IN=(All Midi Inputs) OUT=(Synthesizer Midi-in) (I record midi notes & data to this track).
  4. In the VST Ctrlr panel connect to the †Midi-in and **Midi-out ~ connected to Synth (you disabled them in Cubase ( See step #1)).
  5. I found the only Midi-thru setting that needs to be checked was
    MIDI→Midi Thru→”Plugin-host->Output Device”
    (The 5th option down in the fold out menu)
  6. Engage Monitor on Both tracks.
Running as VST under Reaper

(This is the Juno’s audio output)

  1. Insert – Track
  2. Record Arm
  3. Monitor Input (right-click record button)
  4. Track Input:Stereo Input

(Ctrlr VST settings)

  1. Insert – Virtual Instrument on New Track – Panel
  2. Routing – MIDI Hardware Output –  Synthesizer (Juno)
  3. Ctrlr MIDI – MIDI Thru – Deselect “Input Device -> Output Device”
  4. Ctrlr MIDI – MIDI Thru – Select “Plugin Host -> Output Device”
  5. Ctrlr MIDI – “Input from host to comparator”
  6. Ctrlr MIDI – “Output to Plugin Host”
  7. SYNC with  Synthesizer (Juno)


Version 0.37 beta ※ 11/19/2020
Version 0.38 beta  ※ 11/23/2020
   [1] Fixed next/previous menu selection
   [2] Added MIDI selection in Admin area.
   [3] Choose between how program changes update data on the Juno
Version 0.39  ※ 11/23/2020
   [1] Fixed next/previous menu selection initialisation bug
   [2] Changed image directory cache folder.
Version 0.40  ※ 11/27/2020
   [1] Added panel styling customisation.
   [2] Various stylistic changes.
Version 0.41 ※ 11/28/2020 
  [1] Visual bug fix
  [2] Code Optimisations
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