When I started producing, every tutorial felt like it was in a foreign language. "Set your attack time, adjust the Q, bus-compress the parallels, and render the stems." I'd nod along pretending I understood while my mix sounded like a dumpster fire.
This glossary is the reference I wish I had on Day 1. Every term is explained in plain English — no circular definitions that use more jargon to explain jargon. Bookmark this page. You'll use it constantly.
A – D
ADSR — Attack, Decay, Sustain, Release. The four stages of a sound's volume envelope. Attack = how fast the sound reaches full volume. Decay = how quickly it drops to the sustain level. Sustain = the level the sound holds while the note is pressed. Release = how quickly the sound fades after the note is released.
Amplitude — The loudness of a sound wave. Higher amplitude = louder. Measured in decibels (dB).
Arpeggiator — A tool that plays the individual notes of a chord in sequence, creating patterns from a single chord press. Think of the intro to "Jump" by Van Halen.
Arrangement — The structure of a song — how sections (intro, verse, chorus, bridge, outro) are ordered and layered over time.
Attack — (1) On a compressor: how quickly the compressor starts working after the audio exceeds the threshold. (2) On a synth: how quickly the sound reaches peak volume when a note is played.
Automation — Recording parameter changes over time. For example, automating volume to fade out a track, or automating a filter cutoff to open gradually during a build.
Auxiliary (Aux) Send — A routing method that sends a copy of a track's signal to a separate bus (usually for effects like reverb or delay), so multiple tracks can share the same effect.
Bit Depth — The number of bits used to represent each audio sample. Higher bit depth = more dynamic range. 16-bit is CD quality (~96dB range). 24-bit is studio quality (~144dB range). Always record at 24-bit.
Bounce / Render — Exporting your project (or a selection of tracks) to a single audio file (WAV, MP3, etc.).
BPM — Beats Per Minute. The tempo of a song. 120 BPM = 120 beats per minute = 2 beats per second.
Bus — A channel that combines multiple tracks into one signal for group processing. For example, a "drum bus" combines kick, snare, hi-hat, and toms so you can compress and EQ them together.
Clipping — Distortion caused by audio exceeding 0dBFS (the maximum level a digital system can handle). Always bad in digital audio unless intentional.
Compressor — An audio tool that reduces the dynamic range by turning down audio that exceeds a set threshold. See our complete compression guide.
Crossfade — A smooth transition between two audio clips where one fades out while the other fades in simultaneously.
DAW — Digital Audio Workstation. The software used to produce music. Examples: FL Studio, Ableton Live, Logic Pro, Cakewalk, GarageBand.
Decibel (dB) — A unit measuring sound intensity. 0dB in digital audio is the maximum level. Sounds are measured in negative values (-6dB, -12dB). Each 6dB roughly doubles or halves the perceived loudness.
De-esser — A specialized compressor that reduces sibilance (harsh "S" and "T" sounds) in vocals by compressing only the problematic high frequencies.
Delay — An echo effect that repeats audio after a set time. Can be synced to tempo (quarter note delay, eighth note delay) or set in milliseconds.
Distortion — Intentional or unintentional alteration of a waveform that adds harmonics and grit. Saturation = subtle, warm distortion. Overdrive = moderate. Fuzz = extreme.
Dry/Wet — The balance between the unprocessed (dry) and processed (wet) signal. 100% wet = only the effected sound. 0% dry = only the original sound. 50/50 = equal blend.
E – H
EQ (Equalization) — A tool that adjusts the volume of specific frequency ranges. Boost to enhance, cut to remove. The most important tool in mixing after volume faders.
Fade — A gradual increase (fade in) or decrease (fade out) in volume. Used at the beginnings/ends of clips and songs.
Filter — A type of EQ that removes frequencies above or below a cutoff point. High-pass filter = removes frequencies BELOW the cutoff. Low-pass filter = removes frequencies ABOVE the cutoff.
Frequency — How many times a sound wave completes a cycle per second. Measured in Hz (Hertz). Lower Hz = deeper bass. Higher Hz = brighter treble. Human hearing: 20Hz to 20,000Hz.
Gain — The input level of an audio signal. Gain staging = setting appropriate levels at each point in the signal chain to avoid clipping or noise.
Gain Reduction — The amount (in dB) that a compressor has reduced the signal. A gain reduction meter showing -6dB means the compressor is turning the signal down by 6dB.
Gate (Noise Gate) — A tool that silences audio that falls below a set threshold. The opposite of a compressor — instead of turning DOWN loud sounds, it mutes QUIET sounds (like room noise between vocal phrases).
Glue Compression — Gentle bus compression applied to a group of tracks to make them sound more cohesive, as if they were recorded together. Named because it "glues" the sounds together.
Harmonic — Frequencies that are multiples of a fundamental frequency. A note at 100Hz has harmonics at 200Hz, 300Hz, 400Hz, etc. Harmonics give instruments their unique character (timbre).
Headroom — The space between the peak level of your audio and 0dBFS (clipping). Having 6dB of headroom means your peaks are at -6dB, giving you 6dB of safety margin.
High-Pass Filter (HPF) — A filter that removes low frequencies below a cutoff point. Lets the "highs pass" through. Essential for removing rumble and mud from tracks that don't need bass information.
I – L
Insert — An effect placed directly on a track's channel strip (as opposed to a send/return). The audio passes through the effect sequentially.
Key (Musical Key) — The set of notes (scale) a song is built around. A song "in the key of C minor" uses notes from the C minor scale. Setting the correct key ensures all your instruments sound harmonious together.
Latency — The delay between an input action (playing a note) and hearing the output (the sound). Lower is better. Professional production requires under 10ms latency.
Layering — Combining multiple sounds/samples to create a single, richer sound. For example, layering 3 different kick drum samples to get the perfect blend of punch, body, and click.
Limiter — A compressor with an extremely high ratio (∞:1). It creates a hard ceiling that audio cannot exceed. Used in mastering to maximize loudness without clipping.
Loop — A section of audio or MIDI that repeats seamlessly. Can be a drum pattern, chord progression, or any repeating musical element.
Low-Pass Filter (LPF) — A filter that removes high frequencies above a cutoff point. Lets the "lows pass" through. Creates the "underwater" or "muffled" effect heard in builds and transitions.
LUFS — Loudness Units Full Scale. The standard measurement for perceived loudness used by streaming platforms. Spotify targets -14 LUFS. See our mastering guide for platform targets.
M – P
Mastering — The final stage of audio production. Preparing a mixed track for distribution by optimizing loudness, tonal balance, and dynamics. The last step before export.
MIDI — Musical Instrument Digital Interface. A protocol for sending musical data (notes, velocities, timing) between devices and software. MIDI doesn't contain audio — it contains instructions that tell instruments what to play.
Mixing — The process of balancing all tracks (volume, panning, EQ, effects) into a cohesive stereo audio file. The step between production and mastering.
Modulation — Changing a parameter over time in a repeating pattern. LFO modulation on a filter cutoff creates a wobble effect. Chorus, flanger, and phaser are modulation effects.
Monitor (Studio Monitor) — A speaker designed for accurate, flat audio reproduction (no added bass or treble boost). Critical for making mixing decisions that translate to all playback systems.
Mono — A single audio channel. All sound comes from one source/direction. Opposite of stereo. Bass and kick are typically mixed in mono for maximum impact.
Normalize — Increasing the gain of an audio file so the loudest peak reaches a target level (usually 0dB or -1dB). Does not add compression — simply turns up the whole file proportionally.
Oscillator — The core sound-generating component of a synthesizer. Produces basic waveforms (sine, saw, square, triangle) that are then shaped by filters and envelopes.
Overdub — Recording additional audio (vocals, instruments) over an existing recording while listening to it. Standard technique for building multi-track recordings layer by layer.
Panning — Positioning a sound in the stereo field (left to right). Center = equal in both speakers. Hard left = only in the left speaker. Used to create width and space in a mix.
Parametric EQ — An EQ with adjustable bands where you can set the frequency, gain (boost/cut), and Q (bandwidth) of each band. The most versatile and commonly used EQ type in mixing.
Phase — The position of a waveform in its cycle. When two identical waveforms are perfectly aligned = in phase (constructive). When opposite = out of phase (destructive, cancellation). Phase issues cause thin, hollow sound.
Plug-in (VST/AU/AAX) — Software that runs inside a DAW to add instruments or effects. VST is the most common format (Windows/Mac). AU = Mac only. AAX = Pro Tools only.
Pre-delay — The time between the original sound and the first reflection of a reverb. Higher pre-delay = more separation between the dry sound and the reverb tail. Keeps vocals clear while still ambient.
Q – T
Q (Quality Factor) — On an EQ, Q determines how narrow or wide the frequency band is. High Q = narrow, surgical cut. Low Q = wide, gentle boost. Also called "bandwidth."
Quantize — Snapping MIDI notes to the nearest rhythmic grid position (beat, 16th note, etc.). Corrects timing imperfections in performances. Over-quantizing removes human feel.
Ratio — On a compressor, the amount of gain reduction applied to signals above the threshold. 4:1 means every 4dB above the threshold becomes 1dB.
Release — (1) On a compressor: how quickly the compressor stops reducing gain once the signal falls below threshold. (2) On a synth: how quickly the sound fades to silence after the note is released.
Reverb — An effect that simulates the natural reflections of sound in a physical space. Types: room, hall, plate, spring, shimmer. Adds depth and space to mixes.
Sample — (1) A recorded sound used in production (a drum hit, a vocal chop, a piano note). (2) In digital audio, a single measurement of a waveform at a point in time.
Sample Rate — The number of samples captured per second of audio. 44.1kHz (CD quality) = 44,100 samples per second. 48kHz = film/video standard. Higher rates capture more detail but require more storage.
Saturation — Subtle, warm distortion that adds harmonic richness. Tape saturation emulates the sound of analog tape recording. Tube saturation emulates vacuum tube warmth.
Send/Return — A routing method where a copy of a track's signal is SENT to a separate effect bus (the RETURN). Multiple tracks can share the same reverb/delay, saving CPU and creating cohesion.
Sidechain — Using one audio signal to control the behavior of an effect on a different signal. Most common: sidechaining bass to kick drum so the bass ducks when the kick plays.
Stereo — Two-channel audio (left and right). Creates width, depth, and spatial positioning. Most music is mixed and distributed in stereo.
Stem — A submix of related tracks exported as a single file. Common stems: drums, bass, vocals, instruments. Used for remixing and collaborative work.
Sync — Aligning tempo between multiple devices, tracks, or applications. MIDI sync ensures a drum machine and DAW play at the same BPM.
Threshold — On a compressor or gate: the level at which the processor starts or stops working. Audio above the compressor threshold gets compressed. Audio below the gate threshold gets silenced.
Transient — The initial, sharp attack of a sound. The "click" of a kick drum, the "snap" of a snare, the "pluck" of a guitar string. Transients carry the punch and presence of a sound.
U – Z
Unison — Playing multiple voices of the same note simultaneously with slight detuning. Creates a thick, wide sound. Super Saw = multiple detuned saw waves in unison.
Velocity — In MIDI, velocity represents how hard a note is played (1-127). Higher velocity = louder, brighter, more aggressive. Lower velocity = softer, mellower. Essential for realistic performances.
VCA — Voltage Controlled Amplifier. A type of compressor circuit known for precise, clean, transparent compression. Used in SSL console compressors.
VST — Virtual Studio Technology. The most common plugin format, developed by Steinberg. VST instruments generate sound. VST effects process sound. VST3 is the current standard.
Waveform — The visual representation of an audio signal. Basic shapes: sine (pure, smooth), saw (bright, buzzy), square (hollow, punchy), triangle (warm, subtle).
Wet — The processed version of an audio signal (after effects). Opposite of dry (unprocessed). A "100% wet" reverb output plays only the reverb, no original signal.
Zero Crossing — The point where a waveform crosses the zero amplitude line. Editing audio at zero crossings prevents clicks and pops at cut points.
Don't try to memorize everything. Bookmark this page and return whenever you encounter an unfamiliar term. Within 3-6 months of active production, most of these terms will become second nature.
This should be mandatory reading for every beginner. I'm screen-capturing each section and making it into flashcards. The internal links to your other articles are perfect too — I can go from learning what compression IS to reading your full compression guide in one click.