Vocalize and jam with powerful voice transformation tools, high-quality effects, and an onboard looper.

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.

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Features

• 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
• ¼-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

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Specifications

• Effect Type:
  • 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) jacks: Miniature phone type
  • MIX (IN, OUT) / HEADSET jacks: Stereo miniature phone type (Stereo, CTIA)
  • MIDI (IN, OUT) jacks: Stereo miniature phone type
  • MIC IN jack: 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
• Expected battery life under continuous use: Approx. 3.5 hours
• Expected battery charging time: Approx. 3 hours
• Dimensions: 188 (W) x 106.5 (D) x 41.7 (H) mm
• Weight (including batteries): 290 g
• Accessories:
  • Leaflet ”Read Me First”
  • USB Type-C to USB Type-A cable