File requirements for mastering

Your audio files should be final,
and in 32 bit (24bit for analogue mixdowns)

Preparing files
Good practice: Mix without master bus processing (removed, not bypassed).
Eventually send master-bus processed mix as well for reference.
Add references to other music, if any.
Add a label copy. Thanks!

Note, that a mix exchange after mastering has commenced may result into additional charges.

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File upload -> Swisstransfer or provide a publicly accessible download location.