The Roland AIRA Compact E-4 Voice Tweaker is a portable, hands-on vocal processor and looper that lets you warp, harmonize, glitch, and layer your voice. Priced at around $270, it doubles as a highly capable creative effects pedal for live performers, beatboxers, and producers. Core Features

• Vocal Effects: Loaded with auto-pitch (for subtle tuning or hard-tuned pop sounds), a 3-voice harmonizer, a built-in vocoder (with four carrier waveforms), and a reverb/delay section. 
• Scatter & Formant Control: Includes dedicated sliders for manipulating voice formants and pitch in real-time, plus a scatter knob for instant digital glitching, panning, and rhythm scattering. 
• Built-in Looper: Features a 24-second looper with unlimited overdubs, undo/redo, and automatic BPM detection.
• Connectivity: Offers a mic input, mix/headset inputs, and USB-C for class-compliant audio/MIDI and bus power. It also runs on a rechargeable lithium-ion battery for up to 3.5 hours of wire-free use
• Just about mint condition. Just used as an occasional studio piece.