Bands on his track record are: Grace Jones, Simple Minds, Arsenal, Hooverphonic, Axelle Red, The Human League, Soulsister, Milk Inc Live, Night of the Proms, Millionaire, The Sore Losers, and many others. Claes also is a sound designer and a noise abatement consultant for complex, city-based, multi-day festivals like Gentse Feesten in Belgium. He has more than 25 years of experience as a teacher with his own Masterclaes programme for live and studio engineers, musicians, songwriters, and producers.
He also shares his knowledge through his popular YouTube channel.