Export each track separately, starting from the beginning of the session. This allows me to easily sync the tracks within the mixing session.
Use WAV or AIFF file formats and export the tracks at the same quality they were recorded. The standard recording format is 24-bit and 48 kHz (44.1 kHz is also acceptable).
Remove all effects from the tracks (compressors, reverbs, and EQs). The only exception is for certain synth sounds where effects are an essential part of the sound.
Consolidate the tracks as efficiently as possible. For example, lead vocals can be placed on a single track throughout the song. You do not need to separate verses, choruses, and bridges into different tracks (unless sections overlap and require separate processing).
Clearly name and number the tracks and organize them into instrument groups (drums, bass, guitars, vocals, synths, choirs, strings, etc.). Below is an example of track naming for a standard band setup:
1. KickIn
2. KickOut
3. SnareTop
4. SnareBottom
5. Tom 1
6. Tom 2
7. Tom 3
8. Overhead L
9. Overhead R
10. Room L
11. Room R
12. Bass DI
13. Bass AMP
14. GTR L DI
15. GTR L AMP
16. GTR R DI
17. GTR R AMP
18. LeadVox
19. BackingVox 1
20. BackingVox 2
If you have specific requests regarding the mix, include a separate text document detailing your expectations and attach it along with the tracks. Also, include the tempo of the song and any possible time signature changes.
Provide a few reference tracks in the same genre that best represent the sound you are aiming for. This helps me get the mix right from the first version.
Tracks can be delivered via WeTransfer or Google Drive.
Before sending, compress the tracks/folders into a .zip or .rar file (except for Google Drive links, where tracks can be directly organized in folders).