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

Welcome to Ultra Mastering — where your music gets the professional mix and master it deserves.

Hear the difference from 15+ years of professional experience.

Producer/Songwriter/Multi-Instrumentalist - The Netherlands | Produce/mix many styles of songs, and very often play drums/bass/guitars/keys (take your pick!) as well! Always working to get YOUR vision across! CumLaude Amsterdam Conservatory (Drums-Pop) | Producer for 8yrs | Grunge/rock background | Lover of good pop songs!

Worked with artists like DonToliver, Khalid, Post Malone, The Chainsmokers. Remixes have been released with UMG, Virgin, Ultra and Sony Records. High-grade ghost production, remixing, mixing/mastering is something Alex can offer alongside his very accomplished resumé.

As seen as America’s Got Talent season 17 semi-finals as the voice of Howie Mandel, John's classically trained voice will astound you with it's power, beauty, range and flexibility. Trained in opera, John can provide the vocals you need for your crossover, jazz, or classical hits. (Also seen at Carnegie Hall, the Lincoln Center, etc)

Versatile trained vocalist and arranger. NO AUTOTUNE used for a clean and natural result. Emotionally driven vocals. Meticulous and accurate work. Professionally trained with Italian singer and vocal coach Tony D’Alessio (X Factor 7’s semifinalist, more than 30 years of touring around the world and frontman of Banco del Mutuo Soccorso).

a northern soul with a heart of gold

I write songs, beats, and everything in between. I have a very unique style and 'sound' that I have cultivated over time making music. I have a great talent for vocal treatments, and electronic/acoustic music production.

Professional recordings. High Level Of Sound