Open Box Roland Aira Compact E-4 Voice Tweaker Portable Vocal Processor and Looper

A vocalist's best friend.

The E-4 Voice Tweaker is an outrageously jammable box of fun that harmonizes, auto-pitches, vocodes, loops, and glitches your voice and anything else you feed it. Flip through hands-on controls to manipulate the sound, and chain in AIRA Compacts and other electronic instruments and let them ride in perfect sync.

Vocal performance tool with powerful voice transformer effects

Instantly shape the sound with pitch and formant sliders

Advanced vocal effects including Auto Pitch, harmony, and vocoder

Dial up unique rhythmic effects with the Scatter knob

Process the sound output with high-quality reverb, echo, tempo delay, and chorus effects

Low-cut filter and noise gate to eliminate unwanted sounds

24-second looper with unlimited overdubbing, undo/redo, and automatic BPM detection

Supports external MIDI control of pitch, harmony, and vocoder functions

1/4-inch mic input with wide-ranging gain control

Headphones output with support for an inline mic

Comprehensive connectivity with audio, MIDI, and sync I/O plus AIRA Link

Class-compliant USB-C audio/MIDI interface—no drivers needed

Lithium-ion battery with up to 3.5 hours of operation per charge

Sturdy construction and robust controls

Connect to other AIRA Compacts and standard MIDI devices with optional BOSS TRS MIDI cables

Inspiring Roland vocal processing.

The E-4 combines powerful voice transformer tools and standard vocal effects with a tactile interface that's meant to be played. This lean, mean machine puts a treasure trove of top-quality processing in a go-everywhere gadget that's endlessly enjoyable and amazingly affordable.

Perform with sound. By working the E-4's inviting panel, you can go from traditional vocal enhancements to punchy beatboxed grooves to striking alien soundscapes—all in a single performance.

Harmonic explorer. Take your singing to the next level with automatic harmony effects. Set the key and chord voicing on the fly. And with Auto Pitch, you can dial in everything from subtle tuning fixes to the hard-tuned sounds heard in mainstream pop tracks.

Channel your inner robot. Use direct-access tools to instantly change your vocal gender, conjure sounds from outer space, or transform yourself into a mechanical persona. There's also a powerful vocoder, which you can drive from a large pool of onboard synth waveforms, the E-4's pitch functions, or an external MIDI keyboard.

Loop and Scatter. Turn one voice into an entire orchestra using the 24-second looper. Overdub layer after layer with the E-4's effects, then slice and dice with the expressive Scatter knob.

Link up and go. Connect a handheld mic to the front input for performing, or use a gaming headset or the inline mic on your earbuds for your next livestream or podcast. Sync with other AIRA Compacts like the T-8 Beat Machine and J-6 Chord Synthesizer, or interface with computer DAWs, mobile music apps, and hardware instruments via USB-C or MIDI.

Effect Types: Auto Pitch, Harmony, Vocoder, Pitch, Formant, Scatter, Reverb, Looper

Maximum Recording Time: Approximately 24 seconds

Display: 7 segments, 4 characters (LED)

Connectors: SYNC (IN, OUT): Miniature phone type; MIX (IN, OUT) / HEADSET: Stereo miniature phone type (Stereo, CTIA); MIDI (IN, OUT): Stereo miniature phone type; MIC IN: Stereo phone type; USB port: USB Type-C (Audio, MIDI)

Power Supply: Rechargeable lithium-ion battery, obtained via USB port (USB bus power)

Current Draw: 500 mA

Battery life (continuous use): Approx. 3.5 hours

Battery charging time: Approx. 3 hours

Dimensions: 188 (W) x 106.5 (D) x 41.7 (H) mm

Weight (including batteries): 290 g (11 oz)

Accessories: "Read Me First" leaflet, USB Type-C to USB Type-A cable