The last of the Classical Juno series, mostly aimed at low-cost target.
Some interesting hybrid analog & digital characteristics with Midi interface and memory.
KEYBOARD 49 keys with no velocity nor aftertouch.
The main panel has 38 membrane buttons + single jog wheel Alpha Dial for data entries: just a few knob for edit... definitively NOT an easy job! however there are 4 shortcuts functions TONE MODIFY for direct access to some parameters like EG attack, brilliance VCF-cutoff, modulation depth and rate.
On the left side board has a Joystick that works as pitch bender and modulation, just nearby some functions buttons : octave transpose, portamento and chord mode memory (outputs also MIDI notes).
Rear panel terminal connectors: Midi and tape interface, stereo output, headphones jack and 3 pedals inputs for Volume pedal for expression (volume, aftertouch and dynamics), 2 footswitches for HOLD and other assignable functions (patchUP, portamento and chord memory).
Power supply is internal
VOICE based on a main CPU Intel 8032AH manages 6 voices.
Each voice has a single DCO with variable octave range from 4' to 32' based on custom Roland IC MB87123P-G which is able to layer and mix various waveforms. The result is a bit quite weird raw sound with some digital background, but not necessary a bad point.
Let's deep the waveforms sections:
- Pulse: 3 different shapes, the last one has variable width.
- Saw: 5 different shapes with variable width
- Sub-oscillator: pulse or saw waveforms with 1 or 2 octave lower range
- White noise: just mix volume paramter.
LFO a single modulator assignable to VCA and VCF- each destination has individual Depth but they share same rate frequency. Just one parameter for modulation engage delay time.
ENVELOPE there is a single-shared EG for amplitude and filter with possbile polarity inversion.
EG counts 4 stages segments + 3 time levels AABBDSR with key follow (keytracking) function for amplitude compensation over octaves.
FILTER is a multimode analog resonant filter with CPU quantised values based on 6* IR3R05 same found Jx10 jx8 or Mks70.
The Alpha filter structure is a 4 poles lowpass + high-pass but only 4 fixed rates values.
EDIT main panel is poor! but there the Midi Exclusive system implementation is rich, in fact
it can be edited by computer software or using the optional programmer modelPg-300, but this arare piece of extra could reach even higher price than the synth itself.
EFFECT section features an analog stereo chorus based on traditional MN3101 - MN3009 (like Juno 60 or Jx3p) with adjustable rate in a old Roland fashioned way: the chorused sound floats around your speakers using stereo outputs.
MIDI basic Control Changes parameters,
MEMORY holds up to 64 ROM sounds + 64 RAM ones.
No way to expand memory in any internal or external media.
All internal settings are memory backup on a lithium CR-2032 soldered to the mainboard. Updated alpha Juno II have cartridge facility called M64-C (the same found on tr-707, jx10, mks-80).
soldered lithium CR-2032 battery
RELATED MODELS :
- Alpha Juno 2 - is bigger with 5 octave keyboard Velocity and aftertouch sensitive keyboard.
- HS-10 - an alpha juno1 with different case.
- MKS-50 1 rack unit with some enhancements like Detuning, Portamento and a double RAM memory.
- PG-300 programmer compatible with all the JUNO series.