Marcos is in demand as a freelance live and studio sound engineer. He has mixed concerts, festivals, nightclubs, conventions, and theatre productions as well as recording and producing several albums. With over twenty years experience, and an assortment of outboard gear, he has a sensitivity that only a musican can bring to a mix.

Over the years Marcos has mixed everything from punk rock, top 40, world music, jazz, pop, international touring acts, blues, reggae (dub being his favourite to mix), to Chinese opera, political speeches, and sports casting.

Currently, he is mixing F.O.H. and monitors at the legendary Commodore Ballroom.