Mixing & Mastering Engineers, Producers & Songwriters who worked with Spectrum Mortis
I'm a professional Audio Engineer specialized in Metal, Rock and Extreme Metal productions. I run my own studio - The Empty Hall - located in Madrid, Spain, where I have produced, recorded, edited, mixed and mastered hundreds of albums and EPs. Also, I have assisted and done preparation work for other renowed Audio Engineers worldwide.
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Grammy Nominated Little Big Town, Jason Aldean, Belle Mt Millions of streams with Major Label and Indie artists Specializes in mixing records and live performances for TV / streaming
Producer, vocal mixing engineer with experience working with top 40 producers and writers.
Having previously recorded with John Mayer, The Vaccines and Franz Ferdinand among others, I want to work with you and bring your vision to life! I am an alumni of Berklee College of Music, USA where I studied voice and piano. I have a Yamaha Grand Piano and a fully functioning home professional home set up for world class piano and vocals.
I turn your ideas into powerful, release-ready tracks with full ghost production, mixing & mastering – fast, polished, and 100% tailored to your sound. Trusted by BMG, Universal Music, Sony Music and many more. Let’s turn your vision into reality!
Producer, mixing engineer, and songwriter with a knack for chill, storytelling-driven music. Inspired by Toto, John Mayer, and Prep, I create vibe-heavy tracks with clean, emotional mixes. Whether you need full production, radio-ready mixes, or poetic lyrics (English/Bisaya), I’m here to help your sound stand out.
I always give my all to every job.
Two-time Grammy nominated, Diamond certified producer/songwriter delivering elite R&B, Pop and sync ready music for major artists, TV/film and brands.
High-end mixing and surgical audio restoration to make your tracks sound professional and polished.
Recent Successes
"If you are looking for professional MIX and MASTERING Koen Heldens will do it the best. "
"Tyler did a phenomenal job demoing the songs I sent him. Very professional, punctual, and easy to work with! "
"Online Guitar Tracks, i.e. Lars, is a great guy to work with. Fast turnaround, dedicated, involved, very flexible, uncomplicated. Nice, clean, melodic guitar work. Not to mention that his price is a steal. Just booked..."
"I'm very happy with the result of work of Eric Greedy, his mixing and mastering process gave life and strength to my music, at the same time sounding professional and nice. I recommend Eric without doubt! "
"Great guy, a lot of drive, willing to get the job done."
"Amazing mix engineer and co-producer. Simon was not afraid to share constructive criticism and really helped make the song the best it could be. He has many other musical services such as tracking and even had a sin..."
"I enjoyed working with FraMusic. He takes the project very seriously as if it was his own song. Nothing better than working with someone who you can trust with your project and who will deliver! He is very patient an..."
"Tom is a very skilled engineer who delivers professional and creative work. He managed to complete work as per requirements in a very short time with excellent results. Great communication also. Highly recommended!"
"Great Artist!"
"Amazing & Super talented .... extremely dedicated :) Thankyou so much "
"Thank you for the patience and professionalism you exhibited while mixing and mastering my songs...Juan is a great mix-master who put the time and effort in to please his clients...Give him a try, he is excellent..."
"Thanks Robert, this was a easy and good collaboration."
