Restoration of degraded audio signal (analog or digital drop-outs, impaired signal, loss of fidelity through wear, etc).
Careful removal of musicians' bumps, clicks, pops, and other non-musical sounds.
Declicking and decrackling of audio sourced from vinyl, acetate (lacquer) discs, or wax cylinders.
‘Unpotting’ of audio derived from dialogue, music, and effects (D/M/E) elements to undo and reverse out up-and-down volume changes built into source material.
Pitch adjustments (for audio recorded or reproduced at an incorrect speed).
Correction of azimuth (group delay time alignment) errors.
Minimisation of 'wow' and 'flutter' (speed irregularities manifesting as pitch oscillations caused by uneven media shrinkage, eccentricity, or mechanical error).