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Roland Alpha Juno 1




Roland Alpha Juno 1
  audio demo trend price : 200€
manual demo demo video comments


Roland Alpha Juno 1 (1985)


The last of the Classical "Juno" series, an interesting hybrid analog & digital characteristics with Midi interface and memory.




info KEYBOARD (weight: 5.4 Kg) 49 keys (no velocity).
The main panel features an LCD display, 38 buttons and a data wheel "Alpha Dial"; on the left side a joystick that acts as both pitch bender and modulation function.

Rear panel terminal connectors:
- Midi interface
- tape interface
- main out
- headphones out
- expression pedal assignable to volume / aftertouch / velocity
- assignable pedalswitch: patch up / portamento on-off / chord memory on-off
- hold pedalswitch input



edit VOICE main CPU Intel 8032AH manages 6 voices polyphony.
Each voice has an assigned DCO oscillator based on custom Roland IC MB87123P-G.



edit OSCILLATOR the DCO is composed 2 main summable waveforms + 1 sub oscillator + 1 noise generator:

Waveform name: Harmonic variations: Level mix: Variable width: Octave range:
pulse 3 - yes (3rd shape) 4' 8' 16' 32'
saw 5 - yes (3rd shape) 4' 8' 16' 32'
suboscillator 5 yes - 1 / 2 oct below
white noise 0 yes - -

filter FILTER multimode VCF based on 6 X IR3R05.
1- lowpass at -24dB/Oct : with resonance that does not reach auto-oscillation
2- highpass: 4 scaled values
The VCF provides a 15-levels keytracking system.

filter VCF

adsr LFO a single delayed modulator and 2 destinations with individual depth values:
1- DCO pitch
2- VCF filter

adsr ENVELOPE a single 4-stages + 3 time levels with polarity inversion EG assignable to:
1- DCO pitch
2- VCF filter cutoff
3- VCA amplitude
with special gate mode
In addition the VCA provides a 15-levels keytracking system.



adsr PERFORMANCE some special functions:
- octave transpose keyboard
- portamento
- chord mode learn (it outputs Midi)
- bender range 1 octave setting
- key transpose
- 15 aftertouch levels (by Midi IN) assignable to VCF / DCO / VCA

fxEFFECT section features an analog stereo chorus based on MN3101 & MN3009 IC like Juno-60 or Jx-3p with adjustable rate


midi MIDI some basic CC# are managed including:
- modulation
- foot control
- portamento time
- hold

memory MEMORY
- 64 ROM presets
- 64 RAM slots
Sounds must be saved to magnetic tape or Midi exclusives data dump
Memory system works with a lithium battery model CR-2032 soldered to the mainboard.

Roland Ju1 mainboard

edit EDIT main panel lacks many real-time commands, but there are many computer software or it is possible to use the dedicated optional programmer model PG-300.
- Alpha Juno Control (MAC / free)
- VST AU Alpha JUNO Editor (MAC-PC / $$)
- Midiquest (MAC-PC / $$)
- MKS-50 (Atari ST / freeware now)

alpha juno editor


Alpha Juno 2 Alpha Juno 2


Ju2 is bigger with 5 octave keyboard velocity and aftertouch sensitive keys
MKS-50 MKS-50 rack unit with some enhancements like Detuning, Portamento and a double RAM memory.
HS-80 HS-80 consumer version of alpha Juno2 with different outfit.
HS-10 HS-10 - an alpha juno1 with different case.


PG-300 programmer compatible with all the JUNO series.

effet VST PLUGIN / SAMPLED VERSION there are some free and commercial samples set:

  name price link demo
EFM Oddse PHUTURA free VST emulation
effet phutura vst
audio oddy SMC Joono VST free VST emulation effet SMC Joono VST
odsay REDOMINATOR commercial VST plugin effet redominator


demo SANXION (overdub) with TR-606
demo THE HOOVER! gabber!
demo pad with Miami Acidlab
demo square with Korg KR-55
demo sequence
demo brass with Miami Acidlab
demo bass test with Roland TR-909
demo chorus test
demo filter test
demo filter + chorus test
demo simple 8 bits string
demo crazy LFO!

effet Soundcloud Alpha Juno1

demo1 3 tracks 3 tracks


Roland Alpha Juno 1 Roland Alpha Juno Techno Demo Track Alpha Juno 1 Hoover
demo1 Techno Demo Track Hoover

roland aplha juno pic





Roland Ju1 service manual


original scan



original scan








roland epom demo alpha juno motherboard


- weird DCOs



- edit is painful
- limited EG / LFO


REVIEW "A near classic ! Still a little good analog with good basses .The oscillators have something weird and digital. Try it before buying, it can be a cheap source of worthy analog sounds. "

alpha juno logo



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all snapshots, sounds, texts copyright Polynominal.com / Eric Pochesci

roland alpha juno1 3.5 out of 5 based on 25 ratings. price €200