Sample Rate of: 44.1khz or 48khz
Bit Rate: 16 or 24bit 
The file format is .WAV 
Correctly labelled I.E Kick, Percussion, Leads, Bass, Vocals, Effects etc.. 
Each audio stem has to start from the same position.
Maximum of -6db headroom on each audio stem.
Don’t use a compressor, limiter or maximiser on your master output when exporting stems.
Don't Dither or Normalise the audio.
Slight Silence at the front and end of the track file.
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When you send any audio for Mixing & Mastering please provide the below:
A self mastered or limited version of your track so we get a ball park idea of the track.
A reference track you would like it to sound similar to, Doesn't have to be your own.
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We are happy to do a couple at least 2 Free revisions if required, anymore will be an extra fee.