This project presents a new digital musical interface, CLIVE. CLIVE is designed for vocalists in live performance, particularly in an improvisatory setting. CLIVE is to vocalists what an effects pedal is to a guitarist; it gives the vocalist the power to capture and manipulate sounds from their voice in real time, creating a backdrop of accompanying textures and sonic motifs. CLIVE aims to provide a practical solution to an artistic problem - how to incorporate an interface for a vocalist without drastically altering their performance environment. As a result, CLIVE is small, compact and wearable. CLIVE also aims to extend creative sonic outcomes available to vocalists by the exploration of spectral processing effects. This novel interface demonstrates a minimal and constrained prototype, which allows vocalists to continue performance in a similar environment whilst simultaneously extending the range of performance options and sonic possibilities.