E-4 Boss Voice Tweaker Sound Module-Perform with Sound

The Roland E-4 Voice Tweaker is a portable vocal effects processor designed for singers, beatboxers, streamers, electronic musicians, content creators, and performers who want powerful vocal transformation tools in a compact format. Part of Roland's AIRA Compact series, the E-4 combines auto-pitch, harmony generation, vocoder effects, looping, pitch shifting, formant control, and creative performance effects into a battery-powered device that can be used virtually anywhere.

Whether you're creating polished vocal performances, experimenting with robotic vocoder sounds, producing social media content, or building live vocal loops, the E-4 puts an impressive collection of vocal processing tools at your fingertips. Dedicated controls allow real-time manipulation of pitch, formant, harmony, and effects, making the unit feel more like a musical instrument than a traditional vocal processor.

The built-in 24-second looper lets you layer vocals, create harmonies, build rhythmic vocal performances, and generate unique soundscapes on the fly. With USB-C audio and MIDI connectivity, MIDI control support, synchronization with other Roland AIRA Compact devices, and a rechargeable battery offering up to 3.5 hours of operation, the E-4 is equally at home in the studio, on stage, or on the go.

Features & Benefits

Powerful Vocal Transformation

• Instantly alter vocals with Pitch and Formant controls
• Shift vocal character from subtle enhancement to extreme effects
• Create unique vocal textures for live performance and production
• Real-time hands-on control for expressive performances

Auto-Pitch and Harmony Processing

• Automatic pitch correction for cleaner vocals
• Hard-tune effects for modern pop and electronic music
• Intelligent harmony generation
• Adjustable key and chord settings
• Great for singers, streamers, and content creators

Built-In Vocoder

• Transform vocals into classic robotic and synthesized sounds
• Multiple onboard synth waveforms
• External MIDI keyboard control support
• Ideal for electronic music production and live performance

Creative Effects Engine

• Scatter performance effects
• Reverb, Delay, Echo, and Chorus
• Vocal gender transformation effects
• Experimental sound design possibilities
• Instantly create unique vocal textures and transitions

Integrated Looper

• 24-second phrase looper
• Layer multiple vocal performances
• Create harmonies and beatbox loops
• Perfect for solo performers and live creators

Portable Performance Design

• Rechargeable lithium-ion battery
• Up to 3.5 hours of operation per charge
• Lightweight and compact footprint
• Built for mobile production and live performance

Studio and Performance Connectivity

• USB-C audio and MIDI interface
• MIDI input and output
• Audio sync I/O
• Works with computers, mobile devices, DAWs, and other AIRA Compact gear
• Driver-free USB operation

Technical Specifications

General

• Product Type: Vocal Effects Processor
• Series: Roland AIRA Compact
• Display: 7-Segment, 4-Character LED
• Maximum Looper Recording Time: Approximately 24 Seconds

Effects

• Auto Pitch
• Harmony
• Vocoder
• Pitch Shift
• Formant Control
• Scatter
• Reverb
• Delay
• Echo
• Chorus
• Looper

Audio Connections

• 1/4" Microphone Input
• Stereo Mix Input/Output
• Headset Input/Output (CTIA Compatible)
• Headphone Output

MIDI & Sync

• MIDI In
• MIDI Out
• Sync In
• Sync Out
• USB MIDI

USB Connectivity

• USB Type-C
• Audio Interface Functionality
• MIDI Interface Functionality
• Class-Compliant Operation

Power

• Rechargeable Lithium-Ion Battery
• USB Bus Power Supported
• Battery Life: Approximately 3.5 Hours
• Charging Time: Approximately 3 Hours
• Current Draw: 500mA

Physical Specifications

• Width: 7.4"
• Depth: 4.2"
• Height: 1.6"
• Weight: 11 oz (290 g)

Included Accessories

• USB Type-C to USB Type-A Cable
• Quick Start Documentation