Device Overview

JU-06A Sound Module

The Roland JU-06A is a compact synthesizer that combines the sonic character of two legendary Roland synthesizers: the JUNO-60 and JUNO-106. Using ACB (Analog Circuit Behavior) technology, it recreates the warm, fat sound of these classic analog synthesizers in a highly portable form factor.

Key Features

• Authentic recreation of both JUNO-60 and JUNO-106 sounds with a switch to select between them
• Classic single DCO (Digitally Controlled Oscillator) architecture
• Legendary 24dB/oct low-pass filter with signature Juno character
• Built-in arpeggiator (from the JUNO-60)
• 16-step sequencer
• Chord memory function
• Dual/split mode for layering sounds or splitting the keyboard
• Built-in delay and chorus effects
• Two headphone outputs for sharing

Synthesis Architecture

Oscillator Section

• Single DCO with sawtooth and pulse/square waveforms
• Sub oscillator octave below the main oscillator
• Noise generator with variable level
• PWM (Pulse Width Modulation) with LFO, manual, or envelope control

Filter Section

• High-pass filter (HPF) for removing low frequencies
• 24dB/octave low-pass filter with resonance
• Key follow control for keyboard tracking
• Envelope and LFO modulation

Envelope Section

• 4-stage ADSR (Attack, Decay, Sustain, Release) envelope for amplitude and filter modulation

LFO Section

• Triangle, square, random, and other waveform options
• Rate and delay time controls for vibrato and other modulation effects

Connections

Physical Inputs

• MIDI In (16 channels)
• Mix In (Audio, stereo)
• External Clock In (CV)

Physical Outputs

• MIDI Out (16 channels)
• Audio Out (1/8” stereo mini jack)
• 2 x Headphone outputs (1/4” TRS jacks)

USB Connection

• USB 2.0 Type C
• 16 MIDI channels
• 2 Audio outputs (stereo)

Sound Design Tips

Classic Juno Bass

• Mode: JUNO-106
• Waveform: Square + Sub
• HPF: 0
• VCF Cutoff: 50-60
• VCF Resonance: 0-10
• ENV Attack: 0
• ENV Decay: 50-60
• ENV Sustain: 0-20
• ENV Release: 40-50
• VCF ENV: 50-70
• Chorus: I

Lush Pad Sound

• Mode: JUNO-60
• Waveform: Sawtooth
• HPF: 20-30
• VCF Cutoff: 40-50
• VCF Resonance: 10-20
• ENV Attack: 60-70
• ENV Decay: 70-80
• ENV Sustain: 60-70
• ENV Release: 70-80
• VCF ENV: 30-40
• Chorus: I + II

Bright Lead

• Mode: JUNO-106
• Waveform: Pulse (PWM by LFO)
• HPF: 0-10
• VCF Cutoff: 70-90
• VCF Resonance: 30-50
• ENV Attack: 0-10
• ENV Decay: 50-60
• ENV Sustain: 70-80
• ENV Release: 30-40
• VCF ENV: 40-60
• Chorus: Off
• Delay: Light setting

Modes

JUNO-60 Mode

Captures the distinctive sound of the JUNO-60 (produced 1982-1984), which had a brighter, more aggressive character and included an arpeggiator.

JUNO-106 Mode

Recreates the slightly warmer sound of the JUNO-106 (produced 1984-1988), which became one of Roland’s most popular synthesizers due to its rich sound and user-friendly interface.

Notes

• Part of Roland’s Boutique series of compact synthesizers
• Original JUNO synthesizers were 6-voice polyphonic; the JU-06A is 4-voice polyphonic
• Battery powered (4 x AA) or USB powered
• Can be mounted on the K-25m keyboard unit or DK-01 Boutique Dock (sold separately)
• Includes 64 JUNO-60 patches and 64 JUNO-106 patches