Russ Hepworth-Sawyer is a member of the Audio Engineering Society and co-founder of the UK Mastering Section there. A former board member of Music Producers Guild, Russ helped form their Mastering Group. Through MOTTOsound (www.mottosound.co.uk), Russ now works freelance in the industry as a mastering engineer, writer and consultant. Russ currently lectures part-time for York St John University, UK and the University of Huddersfield, UK and has taught extensively in UK Higher. He contributes from time to time in magazines such as MusicTech, Pro Sound News Europe, and Sound On Sound plus has written many titles for Focal Press and Routledge. Jay Hodgson is on faculty at Western University, Canada, where he primarily teaches songwriting and record production. He is also a mastering engineer at MOTTOsound. His masters have twice been nominated for Juno Awards and topped Beatport's global techno and house charts. He was awarded a Governor General's academic medal in 2006, primarily in recognition of his research on audio recording; and his second book, Understanding Records (2010), was recently acquired by the Reading Room of the Rock and Roll Hall of Fame. He has other books with Oxford University Press, Bloomsbury, Continuum, Wilfrid Laurier University Press, Focal Press and Routledge. Justin Paterson is Associate Professor of Music Technology in London College of Music, University of West London, UK. He has numerous research publications ranging through journal articles, conference presentations and book chapters, and is author of the Drum Programming Handbook. He is also an active music producer. Current research interests are 3D audio and interactive music, fields that he has investigated with prominent industrial organizations such as Warner Music Group. Together with Professor Rob Toulson of the University of Westminster, he developed the variPlay interactive music system. Rob Toulson is Professor of Creative Industries: Commercial Music at the University of Westminster, London. He was previously Director of the Cultures of the Digital Economy Research Institute at Anglia Ruskin University, Cambridge, UK. Rob is a research leader in the field of commercial music, and he has collaborated with many international organizations in the music and audio industries. He is a successful music producer and studio engineer, as well as an experienced mobile app developer, having invented the novel iDrumTune percussion tuning application and the innovative variPlay interactive playback system, in collaboration with Professor Justin Paterson of the University of West London.