Equalisation (EQ) in mastering shapes the overall frequency balance of the entire mix.

Steps for equalising the master track:

1. Visualise the frequency spectrum — Use a spectrum analyser plugin to view the frequency distribution of the master track
2. Identify frequency problems — Look for areas of muddiness (low-mid frequencies around 200-400Hz), thinness, or dullness
3. Apply corrective EQ — Make narrow cuts to remove problematic frequencies and gentle boosts to enhance desired characteristics
4. Use A/B testing — Switch between processed and unprocessed versions to evaluate the impact of your EQ changes

For example, when mastering a Bongo flava song with muddy guitars, you would use spectrum analysers to identify build-up in low-mid frequencies and apply narrow cuts to reduce muddiness while boosting presence frequencies for clarity.

Compression controls the dynamic range of the master track, creating a more consistent and powerful sound.

Steps for compressing the master track:

1. Insert a compressor or multiband compressor plugin on the master track
2. Adjust the threshold to determine at what level compression begins
3. Set the ratio to control the amount of compression applied
4. Configure attack and release times — fast attack catches peaks, slow release maintains natural dynamics
5. Apply makeup gain to restore volume lost during compression
6. Use multiband compression for precise control over specific frequency ranges (bass, midrange, treble)

Common mistakes to avoid:

• Over-compression, which removes natural dynamics and makes the track sound "squashed"
• Excessive makeup gain that introduces distortion
• Setting attack times too fast, which eliminates punch and transients

For a track with heavy bass, adjust the attack and release parameters carefully to control bass peaks while maintaining impact.

Enhancement processing adds character and polish to the master without correcting problems.

Tape Saturation

Tape saturation mimics the warm, analog sound of vintage tape recordings.

Applying tape saturation:

1. Select a track that would benefit from additional warmth or richness
2. Insert a tape saturation plugin into the mastering chain
3. Start with conservative settings and gradually increase saturation
4. Focus on midrange and low frequencies for warmth
5. Use A/B testing to compare processed and unprocessed versions

For instance, when mastering a traditional taarab album aiming to capture 1970s vintage sound, apply tape saturation subtly in the midrange and low frequencies while carefully adjusting levels to preserve clarity.

Exciter

Exciters add harmonics to audio signals, enhancing clarity, detail, and presence.

Steps for using exciters:

1. Place the exciter plugin after EQ and compression in the mastering chain
2. Identify frequency ranges that need enhancement (high frequencies for sparkle, midrange for clarity)
3. Experiment with intensity and blend controls
4. Use A/B testing to evaluate the effect
5. Make fine adjustments to avoid harshness or artificial sound

Exciters help bring out natural sparkle and brightness without introducing unwanted distortion.

Stereo Widening

Stereo widening expands the perceived width of the stereo image.

Applying stereo widening:

1. Insert a stereo widening plugin in the mastering chain
2. Target specific frequency ranges — high frequencies for spaciousness, midrange for presence
3. If using mid-side processing, adjust mid and side channels independently
4. Monitor for mono compatibility issues
5. Use A/B testing to compare enhanced and original versions
6. Make fine adjustments to achieve desired spatial enhancement without compromising compatibility

If mono compatibility is lost after applying stereo widening, reduce the widening effect or adjust the stereo balance to restore balance.

Limiting is the final step that controls peaks and maximizes loudness for commercial release.

Steps for applying limiting:

1. Set the ceiling just below 0dB (typically -0.3dB to -0.5dB) to prevent clipping
2. Slowly increase input gain to boost overall volume
3. Adjust attack and release settings carefully to preserve dynamics and transients
4. Aim for approximately 3dB of gain reduction to maintain dynamic range
5. Listen closely for any distortion or loss of clarity
6. Compare the limited version with the original to ensure quality

Always limit with caution — excessive limiting flattens dynamics and reduces the emotional impact of the music.

Exporting finalises the mastered track for distribution.

Steps for exporting:

1. Verify all processing and adjustments are complete
2. Check sample rate and bit depth settings (commonly 44.1kHz/16-bit for CD, 48kHz/24-bit for digital distribution)
3. Select the appropriate file format (WAV, AIFF, or FLAC)
4. Choose the correct POW-R dithering option based on music style and dynamic range:
   • POW-1 or POW-2 for music with lower dynamic range
   • POW-3 for wide dynamic range music
5. Select a destination folder and give the file a descriptive name
6. Export and verify the file plays correctly
7. Create a backup copy for safekeeping

If discrepancies are noticed in the exported file, double-check export settings and compare with the original mix before re-exporting.

In Tanzania, a young music producer in Dar es Salaam who has learned mixing and mastering skills can offer mastering services to local artists and bands producing demo recordings. Using a home studio setup with a computer, DAW software, and studio monitors, they can master songs for artists performing at community events in places like Mlimani City or local weddings, charging between TSh 50,000 to TSh 150,000 per track. This skill enables entrepreneurs to build small music production businesses that serve the growing demand for professionally finished music in Tanzania's vibrant music industry.