Online audio mastering

Human Mastering You Can Trust

Get started with your free test master


My name is Cefe Flynn, I’m a mastering engineer offering online mastering services from my purpose built mastering studio in Sydney, Australia.

You’ve already put a lot of work and heart in your music, I’m here to help you with that extra little push to cross the final line to get your music ready to be released out to the world.

For this, I work with an assortment of some of the finest analog and digital equipment; however, gear alone can’t deliver a great sounding master. I pride myself on having a clear and straight forward communication making sure to achieve 100% the final sound customers were looking for. See what other artists have to say here.

If you’ve never worked with me before, you might be wondering, what can this guy do for my music? Fair enough, for this reason, I offer a free mastering sample to all new potential customers. Request your sample and hear the difference my mastering can make on your final mix. 

Questions? Get in touch hereand I’ll come back to you shortly. 

Looking forward to hearing from you.



happy clients.

See What Other Artists Have To Say

  • Chris Andrade AvatarChris Andrade

    I recently worked with Cefe in my album and I'm really happy with the results and the experience overall.Attention to detail, great communication, and most importantly he cared about the final result of my music.He kindly gave me some useful tips & advice about the mixing and things that can be improved. Very patient as he gives you the chance to correct and tweak whatever it's needed to get the best result for your music.I will totally recommend Cefe to anyone who wants to take his music to another level.5 Stars Service! Cefe es el mejor!

    damien owens Avatardamien owens

    Not only did Cefe do an absolute fantastic job mastering my track but i also found him very professional to work with and would recommend him to anyone. Not only did he get it spot on 1st time he also managed to beat all the online mastering algorithms and my mix buss ( Ozone 9 ). i can't thank him enough for his work and input. I was glad to have had this experience!

    Alexandre Figueiredo AvatarAlexandre Figueiredo

    positive review  I've just mastered a song with him and I do recommend it! He was reliable and he answered all my questions, showed me different options, gave me some insights on my mixing, etc.

    Val Glauser AvatarVal Glauser

    Cefe is great to work with, patient and gives helpful advices about the mix . He will go the extra mile to get the best result for your music. Very reliable. Thank you Cefe!

    mark stackpool Avatarmark stackpool

    Cefe did an amazing job getting The Stray Dogs to sound their absolute best. Cefe was efficient, helpful, knowledgeable, professional and good value for money.

    Dyson Eldh AvatarDyson Eldh

    awesome mastering! could not be happier! easy to contact and is working really fast! huge recommend for anybody struggling with mastering files! 🙂

  • Wanice Alfes AvatarWanice Alfes

    Highly professional service. Perfect mastering, courtesy, and timely delivery. I will certainly keep the partnership for future projects!

    carmen lysiak Avatarcarmen lysiak

    Cefe provides incredible attention to detail and is patient and so dedicated to his craft. Having worked with a number of engineers previously-I found he really listened to what was requested and made things sound so much richer than what they were before-am very happy with the improvement in sound quality. A true professional.

    Dave Matthews AvatarDave Matthews

    I was very happy with Cefe's work mastering one of my tracks. He spotted a potential issue with my mix and allowed me to fix it before remastering the track again. Will hopefully be working together again in the future.

    Joey Robinson AvatarJoey Robinson

    If you really want quality and professionalism all in one place, Cefe Flynn Mastering is where you need to go!!! Fast turnaround and quality. I will definitely send my music to Cefe Flynn for my next project.

    Foolish Balter AvatarFoolish Balter

    Great work! Loved how responsive and caring he was about the tracks.Anytime I need something mastered, this is the guy ill go to!

    saygin suzen Avatarsaygin suzen

    I've recently worked with Cefe for mastering my tracks and am very happy with the outcome. Very professional and supportive!

  • Dean Clarke AvatarDean Clarke

    My band, Brutalist Architecture in the Sun, like to put B-sides on our single releases and extra tracks and we have given him 4 tracks so far. It can be expensive doing stem mastering for these so we tried out Cefe Flynn to master these tracks. I went in sceptical but we have been really pleased with the results. Cefe is very responsive and produces great results. He is also very good to ensure the tracks we send him are the right quality and he has been great at balancing loudness with a dynamic mix. 5 stars.

    Clayton Priske AvatarClayton Priske

    We are Jo Kamel Band an indie band out of Vancouver Canada, Cefe Flynn is a master and mixing genius. I work with David Stone from Ritchie Blackmore's Rainbow and Max Webster he is my producer, Mentor and plays Hammond B-3 for the band. So after years of working with the best people in the music business. I know what I am talking about. Even Jo Kamel Bands Record Label, Bentley Records agreed this mastering Rocks!!!

    Bob Cunningham AvatarBob Cunningham

    positive review  So glad I found Cefe for my music...he makes it come alive. He'll work with me to achieve the sound I had in mind and what it may need to really shine in that huge sea of songs out there.

    Nilla Green AvatarNilla Green

    Great service and quality. My song came out great and I was able to communicate with Cefe on what I wanted. I definitely recommend him!

    Hilton Denis AvatarHilton Denis

    what can say cefe is da man! for all your sound needs super efficient and super quality sounds 🙂

    Leo Davids AvatarLeo Davids

    Cefe is a real profesional. He mastered my song very well. It was awesome and I’m very satisfied.


Listen To Before & After Mastering Samples

Hip Hop
Nilla Green
Alt Rock
Caleb Owens
Deep House
Jazz Fusion
Hip Hop
Rosegang N Flamingo
Alt Rock
Ava Luna
Tech House

* Song snippets at 128k Mp3. All songs copyright their respective songwriter, producer, artist, or label.


What you’ll get when working together

Human mastering

Unlike automated mastering engines, I'm fully dedicated to your tracks. No algorithms or presets are used in my process.​

purpose built studio

Purpose-built mastering studio with an assortment of some of the finest analog and digital equipment.​

fast turnaround

48 hrs turnaround for singles. 3-5 days turnaround for EP/Albums.

free mix revisions

Need to remix a song to fix a problem? I’ll happily master your track again.

free pre master feedback

If there's anything that might impact the final master - I'll provide you with feedback before I master your tracks.​

guaranteed results

Unlimited revisions and 30 days money back guarantee.

mastering engineer.

A Little Bit About Myself And The Reason For This Page and blog

My name is Cefe Flynn, mastering engineer based in Sydney, Australia. Early on in my career as a recording and mixing engineer, I was amazed to see just how many artists skipped mastering simply because it was too expensive or too hard to find the right engineer. Yet mastering is so important. It’s the only way that your music will be able to stand out or even be accepted in the music industry.

Independent artists shouldn’t have to miss out on the benefits of professional mastering. That’s why I launched my online service, Cefe Flynn Mastering – to bring high-quality, professional and affordable mastering to all artists – no matter how big or small.

My focus is on what is most important for both of us, your music career. Mastering is the last step in the production side of things but a great song and a great master alone will not get you too far. I have been an audio engineer for many years and seen over and over again that once the song is finished and ready for release most artists just haven’t thought about the next steps and don’t know what to do with their songs.

I’m here to help you not only to finish your songs and get them release ready but also to provide with guides and tips on this beautiful but complicated journey of releasing music to the public.

Before you go for AI (artificial intelligence), algorithm based automated mastering like or the more expensive options, Sage AudioMercury MasteringStudios 301Abbey Road StudiosMasterDiskBernie GrundmanGateawaySterling and others.

I want to invite you to grab your free mastering sample and compare the results with any of these other services yourself. 


Frequently Asked Questions

There has never been an album worth mentioning that was not properly mastered by a professional engineer. Most artists understand the music-making process except for the final and most crucial step. Mastering isn’t just about making your song as loud as possible. It’s about balancing your track to translate better and provide a great listening experience to your audience. You can learn more about what is mastering and why is necessary at all here.

Searching for mastering engineers on Google is confusing right? From Grammy-award winners to automated mastering engines – so… How do you know who’s worth paying for? And how do you know who’s right for your music? The simplest and quickest way you’ll know is by previewing your mastered track. That’s why I offer a FREE mastering sample for all new clients.

By getting a 2 minute mastered sample of your song – you’ll be able to see how your mastered track sounds before you spend a cent and we’ll both know whether my mastering style is right for you. If you like what hear you will then have the option to buy your full-length master ready to compete with the current top charted songs in your genre.

Yes I do. If you are not happy with my work, you can contact me for free revisions within 30 days. I will do whatever it takes to meet your requirements during our revisions process. If after the revision process we decide that I am not the right person for your project, just contact me for a refund. My only requirement is that my mixes/masters are not released for sale or promotion and that refunds are requested within 30 days of receiving mixes or masters.

Short answer, please submit WAV file at project’s original sample rate (eg: 44.1khz) and 24bit.

For more in please see my guide on how to prepare your files for mastering here.