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Roland Alpha Juno 1




Roland Alpha Juno 1
alpha juno logo
audio demo trend price : 200-250€
manual demo demo video comments


Roland Alpha Juno 1 (1985)


The last of the Classical Juno series.

Some 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 functions.

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.
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 - -

structure dco

filter FILTER
multimode VCF based on 6 X IR3R05 same found Jx-10 jx-8p or Mks-70:
- lowpass at -24dB/Oct : with resonance that does not reach auto-oscillation
- 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:
- DCO pitch
- VCF filter

a single 4-stages + 3 time levels with polarity inversion EG assignable to:
- DCO pitch
- VCF filter cutoff
- 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 - is bigger with 5 octave keyboard velocity and aftertouch sensitive keyboard.
MKS-50 MKS-50 rack unit with some enhancements like Detuning, Portamento and a double RAM memory.
HS-10 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.


name: price: video URL
redominator $$ HERE LINK
phutura free HERE LINK

alpha juno plugin



Demo note:
track 1 with Roland tr-606

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

original scan



original scan








roland epom alpha juno motherboard alpha juno motherboard


- weird DCOs



- edit is painful
- limited EG / LFO


"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. "




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roland alpha juno1 4.5 out of 5 based on 23 ratings. price €200