Jennifer Parkin was the lead vocalist with Epsilon Minus on two albums, before she left to form Ayria. Jennifer was also featured as a guest vocalist on many other projects, including Implant Planet Euphoria (Alfa Matrix), Implant Uturn 3 (Artoffact), Glis Balance (Alfa Matrix), Parallel Project Fusion (Sector 9 Studios), Aiboforcen Kafarnaum (Alfa Matrix) and most recently Mexican project Isis Signum released on Advanced Synergy Records.