Online Audio Mastering

Music mastering for artists looking for more than cookie-cutter plug-ins and algorithms.

Get started with your free sample & quote


Hi, I’m Cefe, a mastering engineer offering online mastering services to indie artists, labels, hobbyists and producers.

I pride myself on partnering with my clients to help them achieve the vision they had in mind for the project. Whether you’re just starting out or you’ve got a killer mix that just needs the finishing touch from a dedicated mastering engineer, I can get your music where it needs to be using the latest in industry standards and top-level analog and digital audio tools housed in my purpose-built mastering studio in Sydney, Australia.

My passion is helping new artists breakthrough, so I strive to keep my rates affordable to everyone. If you haven’t worked with me before, please go ahead and get started by requesting your free mastering sample and quote. I’d love to hear about your project.

Cefe Flynn Signature
Cefe Flynn Mastering Engineer in his mastering studio


These are the reviews of some of the artists, producers, engineers and musicians who entrusted us with their music and chose to do the mastering in our studio.

  • 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....

  • Look Mum No Bands AvatarLook Mum No Bands

    Cefe knew exactly what my song needed and was able to describe that to me perfectly. I knew then exactly what he was going to do and how my song would turn out. It actually turned out better than expected. Interestingly, my recording was more live and minimal than most and he was able to appreciate what I was trying to achieve and enhance it. In my search for a mastering service I wasn't able to find this anywhere else...

  • 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!

  • Slow Wave AvatarSlow Wave

    Cefe is a legend!He happily dedicated time and effort to make sure the project turned out great and was always patient and kind.He also deserves huge props for the FREE MASTERING SAMPLE service that he offers to his customers.Cefe Flynn Mastering deserves lots of attention and I would definitely recommend.Thanks again Cefe!

  • Michael Stephens AvatarMichael Stephens

    I’ve used Cefe Flynn’s mastering service by recommendation for two of my releases this year. Cefe provides a very fast and accessible service which delivers consistently good results. I intend to utilise Cefe’s services for my future music releases, and I’d happily recommend him to anyone else looking for the same.

  • Jaxon Italiano AvatarJaxon Italiano

    Cefe did a fantastic job of creating the masters for my band's album. The process was quick, easy and very straightforward, not to mention the affordable rates offered by his service. We were very happy with what we received as our masters and look forward to enjoying the same experience in the near future.

  • Sölvi Karlsson AvatarSölvi Karlsson

    Wonderful to work with Cefe! A quick time to return and always ready to listen to suggestions and work together on the final product. He took my indie/Alt-rock record and took it way beyond my expectations! 5-stars will definitely contact again!Thanks again Cefe!!

  • Dexter Allen AvatarDexter Allen

    The service was Great!! The finished product was Fantastic!!! I’d recommend Ceff to any music maker in the music business today. Turnaround time is punctual and the website is very user friendly. Looks like I’ll be making this my mastering home.

  • Miss Lady Blues AvatarMiss Lady Blues

    I am truly pleased with the mastering I received on my callaboration with Awesome Bo ....titled "Body Bumping"!! The turn around time was amazing!! I will be mastering my next album with Cefe Flyn Mastering! 💯❤#MuchLove~Miss Lady Blues~

  • Hedy Blaazer AvatarHedy Blaazer

    Cefe did a great job on my EP- super fast turnaround, professional service and genuinely seemed to care about the music. Also as an independent artist it really gives you peace of mind to have unlimited revisions!

  • Davide C. AvatarDavide C.

    Cefe is a great professional! very helpful and prepared, always ready to give advice on the mix to have the best mastering.thanks Cefe and to our next work together!AVVOLTE BAND from Italy

  • ALfredo Nieves Quesada AvatarALfredo Nieves Quesada

    Simply the greatest online mastering service right now. Very happy with the results!

  • Liam Fitzgerald AvatarLiam Fitzgerald

    Great, affordable mastering option!I've used AI mastering services before but you really can't beat the service and flexibility of having someone to talk about your music with!Cefe had a great understanding of what we had conceptualised and was easy to speak to about revisions.I would absolutely recommend this service if you are looking for an affordable way to have a master done by a someone who will care about your project.

  • Salacia's Universe AvatarSalacia's Universe

    Cefe is excellent at Mastering tracks and am have been happy with the work he has done for my tracks. I was looking for a mastering business that was reputable and experienced in the music industry and Cefe has that, he has been more than wonderful and the best professional mastering man. I highly recommend Cefe Flynn Mastering. Definitely thr best one based in Sydney.

  • Nirak Rebal AvatarNirak Rebal

    Fast, nice communication and great mastering. The first audio samples are sent to you after a very short time and you can bring in your own ideas. Didn't think online mastering was that easy.

  • 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.

  • John Vlahos AvatarJohn Vlahos

    Cefe was recommended to me by a recording studio engineer. The band and myself were very happy with the mastering and Cefe was great to deal with 🙂

  • 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!

  • Jerry Brantner AvatarJerry Brantner

    First off, Cefe Flynn offers a FREE sample of your mastered track BEFORE committing. That to me, was '5-stars' right out of the gate as an artist. It made me feel confident enough that this was an actual human person vs. these online quick-mastering services that really haven't a clue to true post-production done in genuine form. Cefe was awesome to deal with on a personal level and made my track sound like a major production recording...

  • 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.

  • Haydn Holden AvatarHaydn Holden

    Pleasure working with Cefe. Fast working, went out of his way to try new things- nothing was ever too much trouble. Will definitely use again. Highly recommend.

  • Oliver Rook AvatarOliver Rook

    Very professional and friendly, with a great final product. Great value for money and I can't see a reason to go to anyone else for mastering now. 10/10

  • 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...

  • 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!

  • Keen Champ AvatarKeen Champ

    He replies fast and works fast!East to communicate and work with.My song became greater than I expected by his skill!Just amazing job.

  • 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.

  • Colin Appleby AvatarColin Appleby

    Fantastic job, great communication and will be working with again on future projects.

  • David Evans AvatarDavid Evans

    From giving advice to mastering your sound I will always be here!!!

  • The Ambienture Inn AvatarThe Ambienture Inn

    Clear, loud and punchy sound! Thanks!

  • Deepin pradeep AvatarDeepin pradeep

    Really easy to work with, Took every suggestion and turned it into more than expected. Will definitely keep working with cefe!!!!! Would definitely recommend to anyone who wants to work with someone on his professional Level.

Before & After Mastering Samples

Hear the difference professional mastering can do for your music.

The Parasols
Gold Flag
Gbh Jersey
Tech House
Dexter Allen
Caleb Owens
Hip Hop
Jazz Fusion

Mastering Services

Stereo mastering is achieved with just one audio file. I will enhance your song to give you the optimum balance and loudness.

If you are happy with your mix and want that amazing final touch to give your track clarity and punch, then a stereo master will be perfect.

If you’re looking for a dramatic sonic enhancement, then stem mastering is for you. With stem mastering, you’ll send me groups of audio tracks from the project.

This gives me greater control over the final sound and allows me to fine-tune your mix’s main elements to perfection.

All mastering services include:

Unlike automated mastering engines, you’ll have a dedicated mastering engineer working on your tracks.

Each track includes unlimited revisions so we can work together to help you create the sound you’re looking for.

If there’s anything with your mix that might impact the final quality of the master, I’ll provide you with personalised feedback – free of charge. Need to remix a song to fix a problem? All good, I’ll master your track again.

If you’re not happy with my work for any reason, please let me know so that I can make it right. If it’s clear after the mastering revision process that things aren’t working out on this project, check out my refund policy to proceed.

Frequently Asked Questions

Mastering is the finalization process where everything gets baked together. This is where the mix is perfected, and the track as a whole is worked on to give it shine, sparkle, volume, depth, punch and loudness.

During the mastering process, as an audio engineer, I will typically utilize different tools like compression, stereo width tools, limiters, maximizers, EQ, automation and more to ensure that the final master achieves the right levels to meet industry standards and the proper tone for your style of music. 

You can learn more about what is mastering and why it is necessary at all here.

If you plan to release your music to the public, the benefits that come along with a professionally mastered track can be immense. 

Today’s listeners have become accustomed to a certain sound in modern recorded music. Without mastering, you’re going to have a hard time convincing people that you’re a serious artist if your own tracks don’t measure up. Even the best songs can fall flat without mastering, so this part of the process is integral in representing your music how it was meant to be heard.

My first goal in mastering is to make something sound great and not exceed its loudness potential. Its loudness potential is the point above which the sound gets worse, anything louder is by definition a compromise.

I aim to get a sound for the master that the artist and/or label are happy with in terms of their vision for the track, and that is technically correct, and this can sometimes be an iterative process.

Online mastering services such as;;; and more use an algorithm to master tracks – meaning your music will typically not be heard by human ears – instead, your track is run through some software that automatically makes adjustments to volume, compression and EQ based on a formula the algorithm applies.

Algorithm-based mastering can come in handy when you want to get a glimpse at your track’s potential or when you want to check a mix against standardized processing. You may have a quick demo mix that you think sounds good, and perhaps you want to add some overall compression and limiting to get that “radio sound” through a volume boost.

However, these services do tend to work by applying a rubber stamp to each track because no one is actually listening. When you partner with a professional mastering engineer, you’ll receive the personal attention your music deserves, as well as the experience and specialized equipment that come along with a mastering engineer’s touch. 

Additionally, a mastering engineer will be far more likely to offer the ability to make changes to a master after the first pass, giving you more freedom in getting the sound you’re after. You can read more about algorithm-based online mastering services here. 

If you’re unsure, you’re more than welcome to request a free mastering sample, and compare the services yourself.

My rates are typically in the range of $75-$120 USD per track. Prices differ depending on the complexity of the project, type of mastering required (Stereo or Stem Mastering) and the number of songs.

Fill out this form to get a quote for your project, and let me know your budget, particularly if you’re a new artist. We’ll see what I can do to make it work!

I work independently to keep overheads down compared to larger mastering studios which tend to be more expensive, such as Studios 301, Abbey Road Studios, MasterDisk, Bernie Grundman, Gateaway, Sterling and others.

Depending on the complexity, mastering projects generally take 48 hrs for singles and 3 to 7 days for EP/Albums. If you are working to a deadline and need a faster turnaround time, you will have the option to select Rush service while booking your next project

I know hiring a stranger (who might be on the other side of the world!) to master your music can be daunting, so that’s why I’m happy to offer you a free mastering sample.

By getting a 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 you hear, you will then have the option to buy your final masters ready to compete with the current top charted songs in your genre. Upload your track using this form, and you’ll get a sample within 72 hours.

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 we decide that I am not the right person for your project after the revision process, 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.

Payments are due after mastered tracks have been approved and before the release of all final deliverables. 

Accepted payment methods are Paypal and Credit Card.

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

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

All deliverable files will be prepared as per your project-specific requirements. Standard delivery files included in all projects are:

  • 16-24bit/44.1k WAV file – CD and most online distributors (Spotify, TIDAL, etc).
  • High-quality MP3 320kbps for easy online distribution/download.

Questions? Get in Touch

+ 61 466 825 277