Mastering fundamentals

Mastering is a final preparation and quality-control stage for a completed mix and its intended delivery. Depending on the brief, it may include a final tonal or dynamic adjustment, level management, peak control and format checks. A single-track learner project can be ready to export without adding any mastering processor. An empty chain is a valid decision.

Mastering cannot reliably repair a poor arrangement, unsuitable sound choice, severe masking, an unclear focal balance or clipping that already occurred earlier in the signal path. Revisit signal flow and gain staging if the stage where a problem occurs is unclear. Mixing and mastering solve different problems, and their boundaries vary by workflow.

LISTEN

Compare your clean mix with a version using restrained limiting. If useful, also hear a deliberately excessive example, then reduce it. Listen for changes to transients, movement and overall density, not only peak readings. A limiter is a dynamics processor that can control peaks; its controls and behavior vary by design. More level is not automatically a better result, and excessive limiting can alter dynamics or introduce audible distortion.

TRY

If your DAW includes a limiter, use a reversible setting change and compare at similar perceived loudness where practical. The comparison can be approximate. You can also complete the exercise by listening to a provided or imagined before/after description and choosing no processing. Do not chase a LUFS or peak number for an unspecified destination.

Loudness measurement and peak measurement answer different questions. ITU-R BS.1770 specifies algorithms for programme loudness and true-peak measurement; true peak estimates the continuous waveform and may exceed the largest stored sample value. EBU R 128 is a broadcast programme-normalisation recommendation, not a universal target for every music export. A measurement method, a destination’s delivery specification and any later playback normalisation are distinct matters. Check a current destination requirement only when you know where this particular file will go.

APPLY

Decide whether any final tonal, dynamic or peak change solves a stated issue. Keep, refine or remove it; a clean mix with no mastering processing is acceptable. Record why you made the choice, not a target number.

Technical references: ITU-R BS.1770-5 defines programme-loudness and true-peak measurement. EBU R 128 is scoped to loudness normalisation and permitted maximum level in broadcast delivery. Ableton Live Manual: Limiter is one DAW-specific example of a limiter; other processors differ.