Mixing & Mastering Engineers, Producers & Songwriters who worked with Cossmo

Your Go-To Audio Engineer! And only Audio-Engineer!

My name is Neldrick Martis, Producer / Mixer and Mastering engineer living in Amsterdam, the Netherlands. I work out of my studio based near the city center of Amsterdam.

I have 20+ years experience as a musician. I play mainly guitar and bass, but I have my own studio and am a trained engineer and producer. My main project is One Week of Days, which is a group that I have with my wife Jan. Before that I played bass in Kaydee, when we were signed with EMI records.

Music Producer - Publisher - Group of Labels

Quality records only.

- Produced MØ's single "When I was Young" - Artist releases on Spinnin', Armada, Capitol - Official remixes include Martin Garrix, Cheat Codes, Troye Sivan, Billie Eilish, Zara Larsson, The Vamps, Niall Horan, Daya, Tritonal

7x ROG-Nominated Gospel Session Bassist & Guitarist seasoned with 34+ years of experience from St. Croix, VI to the US & Beyond. Contact me to request my help completing your upcoming gospel single and album recording projects.

Hello! My name is Michael and I would like to help YOU with all your mixing, mastering and production needs. I am a University of Southern California student studying music business and music production. I have worked on numerous projects for artists ranging from Hip-Hop to EDM and Pop. I am currently working on a project for Sony and Shiseido.

I’m a professional songwriter and producer who specializes in turning emotions into sound. Think of me as your musical architect—bring the blueprint, and we'll build the masterpiece. From a voice memo to a fully produced, radio-ready track, I handle every step of the process with precision and heart.