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Retro News

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Free Mastering Service

Retroengineering is a serious mastering solution based in Nantes, France. Runned by Tony C (Chevreuil, PercevalMusic), it offers the best results for digital masterings. We decided to create the very first, completely free, mastering studio, with the best service! This …

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New Amphion Systems

We invest in a new speakers system Amphion Two18 + AMP500 + BaseOne25 with silver cables & A Xilica XP3060 processor to calibrate the sound in the room. sounds good!!!  

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Retroengineering Files Transmitter

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RetroWagon Audio Testing

The Caravelle Tourbus Station Auditorium is the best way to test all masters on the road before delivering!  

Free mastering solution

Retro Engineering

Story About Us

The Things you Should Know

Retro Engineering

Retroengineering is a serious mastering solution based in Nantes, France.
Runned by Tony C (Chevreuil, PercevalMusic), it offers the best results for digital masterings.

We decided to create the very first, completely free, mastering studio, with the best service!

This sounds crazy but it is true!!

Retroengineering does audio mastering for supporting Artists & Independent labels in this weird world.
Here, there is not any robots & presets when we compare it to the new automatic-mastering online solutions as LANDR, Cloudbounce or Aria…. and many more!

We provide high-quality audio mastering for musicians and labels around the world.

We are as professional as any other paying mastering studio, putting maximum attention on details.
We use the best gear possible and invested in it years after years.

Analog mastering outboards & digital processing combination will add the ultimate « finishing touch » to your recording, creating a magical experience that can be replicated to the digital & analog domains, for CD, iTunes, streaming, or vinyl.

Do not hesitate to come and test our services, nothing will be charged!
The only trouble you can face will be booking a session as this service is in very high demand !

And when you’re ready to take your recording the next level, send us a message to discuss about your project and schedule a mastering session.

Retroengineering already worked with artists and labels such as College, Mansfield Tya, Passe Montagne, Room 204, Sexy Sushi, Emma Zunz, Gordz, Boy & The Echo Choir, Vierge, Violant Kop, Vicious Klub, Africantape, RuminanCe Records, Effervescence, Humpty Dumpty Records, Sickroom Records, Valerie Records, Futur Records, Invada Records, Teona, Euphrate Records, SK records and many more…

Please, contact us to have more information about booking, conformity, etc…

Retroengineering, professional mastering for everyone!
Tony For Retroenginnering

micro mastering


WAVE NATURE Rackspace Serie

MYTEK 8-192 + DIO Pro Tools HD

AVID Pro Tools HD Native PCI-E

Apple Mac Pro Double Quad-Core Intel Xeon (Westmere) à 2,4 GHz 32Go ram (Mountain Lion | SSD Samsung 840 Pro)
Apple Cinema HD Display 23″

Antelope Isochrone OCX

Dangerous Music Dangerous Compressor
Dangerous Music BAX EQ

Steinberg Wavelab Pro 9.5
Avid Pro Tools HD 11 Native

Brainworx Bx_Master Desk
Dangerous Bax EQ
Shadow Hills Mastering Compressor
Black Box Analog Design HG-2 Flux Audio Solera3
Softube / Weiss EQ1, Weiss Deess, Weiss DS1-Mk3 & Weiss MM1 Maximizer
Izotope Ozone 8 Advanced
Izotope RX4
Izotope Alloy 2
MeldaProduction MMastering Bundle
Metric Halo Channelstrip 3
Metric Halo TranscientControl
Softube Saturation Knob
Native Instrument Driver
Native Instrument Supercharger
Avid Smack!
Avid Maxim
Avid ChannelStrip
TL Space
Waves Gold Native Bundle
Waves J37 Tape
Waves Kramer Master Tape
Waves L3 Multimaximizer
Waves Linear Phase Multiband Compressor
Waves MaxxVolume
Waves OneKnob Pumper
Waves SuperTap
Waves TueVerb
Waves Renaissance Bass
Waves One Knob Pumper

ADPTR AUDIO Metric AB MeterPlugs Loudness Penalty MeterPlugs Perception
MeterPlugs Dynameter
Brainworks TT Meter – Dynamic Range Meter
Bx_Meter – Dynamic Range Meter
Izotope Insign
Melda Production MLoudnessAnalyzer
Kanghelm VUMT Solo & Duo

Amphion Two18 +Amphion Amp500
Amphion BaseOne 25 + Base Amp
Amphion speakers cables
Xilica XP 3060 processor
Bowers & Wilkins Nautilus 805 Signature
Audioanalyse A9
Abacus C-Box3
Dangerous Music Source
Ultrasone PRO900

retro mastering tony chauvin


Everything is free, Enjoy!


(Files sent via Wetransfer, Dropbox, etc.)

(We use a professionnal service for the transfer of your masters)

Tracks: old price 3̶̶5̶̶ €
>>>New price: 0€

Package 5 tracks: old price  ̶1̶̶5̶̶0̶̶€̶̶
>>>New price: 0€

Package 10 tracks: old price  ̶3̶̶0̶̶0̶̶€̶̶
>>>New price: 0€

Package 15 tracks: old price  ̶4̶̶5̶̶0̶̶€̶̶
>>>New price: 0€

With a Package, additional tracks: old price +̶3̶̶0̶̶€̶̶ / song
>>>New price: 0€

(Package included DDPi)

24bit Master 2 songs: (For Vinyl Production at another facility) These are 2 singles 24bit files assembled as SIDE A & B: old price +̶̶5̶̶0̶̶€̶̶  in addition to a conventional mastering
>>>New price: 0€

MFit (Apple Digital Masters) 24bit 44,1-96khz: old price  ̶+̶̶1̶̶0̶̶€̶̶ / song
>>>New price: 0€
in addition to a conventional mastering

MP3 version: old price  ̶+̶̶5̶̶€̶̶ /song
>>>New price: 0€
in addition to a conventional mastering

DDPi 2.0 file set: old price+̶3̶̶0̶̶€̶̶
>>>New price: 0€

PMCD (Redbook CD-R) CD-Master : old price  ̶+̶̶1̶̶0̶̶€̶̶
>>>New price: 0€

Mixing Option : Contact us to have cotation



Here you could download a zip files with some samples of our work

Audio via Audio:

Romain Marsault – Le Mortier Japonais


Almonte (Autoproduction)


All At Seas


DelRio – (WeAre Sharks Records)


Karv Du (Autoproduction)


Master Master Wait  (Metadrone Record (Fr), Les Disques Anonymes (Fr), Rockerill Records (Bel) et SWAO Production)

Chevreuil – Sport (RuminanCe Records & Sickroom Records)


College  – Secret Diary (Invada Records – Future Records – Valerie Records)


Passe Montagne – Long Play (RuminanCe Records & Sickroom Records)


Gordz – Super 100% (RuminanCe Records)


Sabo – 8 Saisons à L’ombre (RuminanCe Records)


Chevreuil – Chateauvallon (RuminanCe Records – Sickroom Records – SUS Inpartmaint)


Percevalmusic – Design (TC REC)

Audio Via Video:




Adrien Kanter, All At Sea, Almonte, Boy & The Echo Choir, College, Chevreuil, Del Rio, Emma Zunz, Faustine Seilman, Gordz, Les Sales Tongs, Limbo Lake, Master Master Wait, Muddigger, Mansfield Tya, Passe Montagne, Percevalmusic, Romain Marsault, Room 204, Sexy Sushi, The John-Pauls, The Rabblers, U-Boat, Vierge, Violant Kop, Vicious Klub…



Steve Albini, Lionel Darenne, Miguel Constantino…



Aagoo Records, Africantape, RuminanCe Records, Effervescence, Humpty Dumpty Records, Sickroom Records, Valerie Records, Futur Records, Invada Records, Teona, Euphrate Records, SK records, Rockerill Records, Bitchy Prod, We Are Shark Records, Wild Youth Records…



Constantino Recording, Electrical Audio, Studio LaFrette, Ohm Studio…



RomainMarsault – Le Mortier Japonais (labels: Un Deux, Burning Church, Abandon Album, Schmalzgrus, Kizmiaz records, Madame Rêve, Super Loto Editions)

Faustine seilman – The Nightwatcher (label: Autoprod)

The John Pauls – Forget to remember to forget ( Label: Aagoo records)

Chevreuil – « Sport » (label : Ruminance Records & Sickroom Records)

Mansfield.Tya – « S/T » (label: Teona)

Room 204 – « S/T » (label : Effervescence)

Percevalmusic – « Viescolaire »(label : Effervescence)

Boy & the echo choir – « and-night-arrives-in-one »(label : Humpty Dumpty Records)

College – « Secret Diary » (label : Invada record – Futur Records- Valerie Records)

Maethelvin – « S/T » (label : Valerie Records)

Chevreuil – « Chateauvallon » (label : Ruminance Records & Sickroom Records)

Mansfield.Tya – (label : Téona – Wagram)

Passe Montagne – « Long Play » (label : Ruminance Records & Sickroom Records)

Passe Montagne – « Extended Play » (label : Euphrate Records)

Gordz – « Super 100% » (label : Ruminance Records)

Chevreuil – « Ghetto Blaster » (label : Ruminance Records & Sickroom Records)

Sabo – « Huit saisons à l’ombre » (label : Ruminance Records)

Emma Zunz (label : SK Records)

Vierge (label : Diagone)

Vicious Klub – « You sound so bitter » (label: Bitchy Prod)

Violant Kop – « From stadium to garage » (Bitchy Prod)

Percevalmusic – « Recueil du mal » (label: TC)

Master Master Wait – « Modern War » (Rockerill Records)

Violant Kop – « Uptight » (Bitchy Prod)

Soakin Sampler Vol 1 (Soakin Records)

Our services

What we really can provide

ampli mastering


Mastering is the final creative step in the recording process to produce a record album or a single for disc, home music server, iPod™, broadcast or internet delivery.

It consists in help the project reach its full potential, and optimizing the end product for all possible environments.

Advenced compression and equalization techniques for all styles of music.

Sequencing, leveling, processing, encoding, PQ Coding and Master preparation.



For the mastering session, we will need:

  • Your song order
  • Any information you have about what you’d like to achieve
  • Any song spacing notes
  • ISRC if you have it,
  • CD-Texts, EAN/UPC, Metadata to insert on your DDP Files or CD-master
  • Please note your files with a number, like the order of your tracks
  • We accept sample rates between 16 Bit / 44,1 kHz & 32Bit float / 192 kHz
  • We prefer stereo interleaved wave files .wav, but we accept split mono files .aif
  • Please don’t send us Mp3 files
  • Create a finished mix with at least -3-6 dB of peak headroom for delivery to mastering
  • Don’t use too much compression on your master bus (It’s better without compression)
  • Keep some « air » on your mixes 2 seconds before the beginning of the song and 2 seconds at the end
  • Bounce your tracks in the same format as you worked in
  • Don’t use « normalize » or any « dither » when you bounce or export
  • We don’t believe in the « stems » mastering process, a good mix can sound great after a good mastering process.
    We think « stems » just procrastinates the moment of choice.
    We believe in the work of recording engineer and mixer, we prefer a position after this practice to give your mixes the best possible sound.
    (90% of the time, artists are present on mixing sessions, not on mastering sessions!)
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