Audio Editing Digital Audio Editing 5 — Questions and Answers
Question 1: What is 'stem mixing' in audio production?
- Grouping related tracks into submixes (stems) that are processed and exported together (Correct answer)
- Mixing audio from multiple stems of a plant-themed project
- Recording each instrument to its own isolated stem track for backup
- Combining two separate mixes into one stereo file
Correct answer: Grouping related tracks into submixes (stems) that are processed and exported together
Stems are grouped submixes—such as drums, bass, and vocals—that allow more flexible mastering, remix delivery, or broadcast interchange than a full mix.
Question 2: What is the function of a 'de-esser' in vocal processing?
- To reduce harsh sibilant frequencies (s, sh, ch sounds) in a vocal recording (Correct answer)
- To remove plosive sounds like 'p' and 'b' from a vocal
- To lower the overall volume of a vocal track
- To add brightness to a dull vocal recording
Correct answer: To reduce harsh sibilant frequencies (s, sh, ch sounds) in a vocal recording
A de-esser is a frequency-specific compressor that targets the 5–10 kHz range where sibilance occurs, attenuating harshness only when those frequencies exceed a set threshold.
Question 3: When normalizing audio, what does 'peak normalization' do?
- Raises or lowers the overall level so that the loudest peak reaches a specified target level (Correct answer)
- Averages the loudness of an entire file to a target LUFS value
- Removes all peaks above a threshold by hard clipping
- Applies a limiter to prevent any sample from exceeding 0 dBFS
Correct answer: Raises or lowers the overall level so that the loudest peak reaches a specified target level
Peak normalization finds the highest amplitude sample and scales the entire file up or down so that peak hits exactly the target level (commonly 0 dBFS or -1 dBFS).
Question 4: What does 'LUFS' stand for and why is it important for modern audio delivery?
- Loudness Units relative to Full Scale; it measures integrated perceptual loudness for streaming normalization standards (Correct answer)
- Linear Units of Frequency Spectrum; used to calibrate EQ curves
- Latency Units for Sample Frequency; relates buffer size to delay
- Level Uniformity Factor Standard; a broadcast signal quality metric
Correct answer: Loudness Units relative to Full Scale; it measures integrated perceptual loudness for streaming normalization standards
LUFS is the standard unit for measuring integrated loudness, and platforms like Spotify (-14 LUFS) and YouTube (-14 LUFS) normalize content to a target, making it essential for masters that will stream.
Question 5: In a digital audio workstation, what is a 'bus' or 'buss'?
- A shared signal path that multiple tracks route into for group processing or summing (Correct answer)
- A type of hardware connection for audio interfaces
- A plugin that simulates analog summing circuitry
- A MIDI controller assignment for fader control
Correct answer: A shared signal path that multiple tracks route into for group processing or summing
A bus is a signal routing destination where multiple tracks are combined, allowing group fader control, shared processing, or routing to the master output.
Question 6: What does 'time-stretching' allow an editor to do without affecting pitch?
- Change the duration of an audio clip to fit a different tempo or length (Correct answer)
- Transpose an audio clip to a different musical key
- Align the frequency content of two different recordings
- Sync multiple takes of the same recording to the grid
Correct answer: Change the duration of an audio clip to fit a different tempo or length
Time-stretching algorithms change the speed (and therefore length) of audio independently of pitch, allowing a loop to fit a new tempo without changing its key.
Question 7: What is the difference between 'destructive' and 'non-destructive' editing in audio software?
- Destructive editing permanently alters the audio file on disk, while non-destructive editing stores instructions that reference the original unchanged file (Correct answer)
- Destructive editing uses more CPU, while non-destructive editing uses less
- Destructive editing can be undone with Ctrl+Z, while non-destructive editing cannot
- Destructive editing applies only to MIDI, while non-destructive applies to audio
Correct answer: Destructive editing permanently alters the audio file on disk, while non-destructive editing stores instructions that reference the original unchanged file
Non-destructive editing keeps the original audio file untouched and records edits as metadata, meaning all changes can be undone; destructive editing overwrites the source file permanently.
Audio Editing Digital Audio Editing 5
What is 'stem mixing' in audio production?