Roland Aira E-4 Compact Vocal Transformer & Looper 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 itFlip through hands-on controls to manipulate the sound, and chain in AIRA Compacts and other electronic instruments and let them ride in perfect sync. 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 soundscapesall in a single performance. Select different sonic shapers, trigger looper controls, cycle through Scatter effects, and tweak pitch, formant, and more in the f