The PhD consists of a portfolio of electric-acoustic compositions and is accompanied by a scholarly dissertation. The portfolio of works explores the development of real time electro-acoustic composition techniques using microphone-captured audio. The portfolio focuses particularly on the voice as a sound source and aims to bring together the author’s background as a popular vocalist with her ‘music-concrete’ influenced electro-acoustic compositional work. The portfolio culminates in the development of a HCI (Human Computer Interface) called the eMic (eMic extended Mic-stand interface controller) which allows the performer to control sound parameters in real-time via common music performance gestures. / Doctor of Philosophy (PhD)