. Mixing

Volume Setting for each session's track.

Correction of Volume Amplitudes,
   for a better Volumes balance.

Balancing of Frequencies
   for Each Track in itself and also in regard to other Tracks.

Placing of Each Track in the Audio Field.

Settings of Soundscape
   (Stéreo, reverberation and other treatments),
   for Each Track, Groups of Tracks, and the Whole.

Other Enhancings and Embellishments.