Overview
Reverb and delay are the two main time-based effects in audio production. While compression and EQ shape the level and tone of a sound, reverb and delay place it in space — giving it a sense of room, distance, and dimension. Used subtly, they make dry recordings feel natural and present. Used more obviously, they become creative effects that define a song's character. Understanding each separately is the first step to using both intentionally.
What You Need
- A DAW with a reverb and delay plugin (your DAW's built-ins are fine for learning)
- A dry vocal or instrument recording to experiment on
- Headphones or monitors
Steps
What reverb does
When sound occurs in a physical space, it bounces off walls, ceilings, and floors — reaching your ears as a wash of thousands of reflections that decay over time. Reverb plugins simulate this. They take a dry signal (your recording) and add a synthetic or captured room response to it, placing the sound inside a virtual acoustic space. The key numbers are pre-delay (the gap before reflections begin — simulates distance between source and walls), decay time (how long the reverb tail lasts), and wet/dry mix (how much reverb vs dry signal you hear).
Reverb types and their characters
Room reverb: small, tight, natural-sounding — mimics a treated recording room. Great for adding presence to a dry voice without it sounding like it's in a cave. Hall reverb: large, smooth, rich — mimics a concert hall. Used on orchestral strings, pads, backing vocals. Plate reverb: a metallic, dense reverb from a physical steel plate resonator. Warm and vintage — the classic snare and lead vocal reverb of the 60s–80s. Spring reverb: bouncy, lo-fi, characteristic of guitar amplifiers. Convolution reverb: captures the impulse response of a real space (a cathedral, a bathroom, a specific studio) and applies it mathematically. The most realistic but the most CPU-intensive.
Key reverb controls
Pre-delay (10–30ms): Delay the reverb tail slightly so the initial transient of the sound hits cleanly before the wash begins. This keeps vocals intelligible — without pre-delay, the reverb smears into the attack and muddles the word. Decay / RT60: How long the tail lasts. Short (0.3–0.8s) for natural presence; medium (1–2s) for character; long (3s+) for dramatic effect. Match decay to tempo — tails that extend past the next beat cause rhythmic mush. Damping: High-frequency damping makes the reverb tail roll off at the top end, simulating soft furnishings. Reduces harshness. Wet/Dry mix: For vocals on a send channel, set the plugin to 100% wet — you control the mix with the send level on the track.
What delay does
Delay captures the input signal and plays it back after a set time — like an echo. Unlike reverb's thousands of overlapping reflections, delay is one (or a few) distinct, audible repeat(s). It adds space, width, and rhythmic interest. A single delay repeat can make a vocal feel larger without washing it out. Multiple repeats create the classic echo effect. The key control is delay time (the gap between the original and the repeat, measured in ms or synced to BPM), and feedback (how many times the repeat repeats — how quickly it fades). Use our BPM to Delay Time Calculator to find the right ms values for any tempo.
Delay types and practical settings
Slapback delay (50–150ms, 0 feedback): A single short echo used on vocals, especially in country and rockabilly. One quick repeat that adds size without obvious echo. No feedback so it's heard once and gone. Ping-pong delay: Alternates repeats between left and right channels — creates stereo width and movement. Keep feedback low (2–3 repeats) or it clutters. Tempo-synced delay: Delay time is set to a note subdivision of the song's BPM (eighth note, dotted eighth, quarter note). The repeats fall rhythmically in time with the track — a classic pop and electronic music technique. Dotted eighth delay (the Edge from U2's main technique) is the most commonly used.
When to use reverb vs delay
They solve different problems. Use reverb when you want to place a sound in an acoustic space — to make a dry vocal sound like it was recorded in a room, or to give a snare the sense of a large hall. Use delay when you want to add rhythmic interest, width, or size without washing out the sound. Many producers use both together: a short delay feeds into a reverb, so the delay repeat has its own sense of space. For podcast and VO audio: typically use neither — clean, dry audio is the professional standard for voice. If there's unwanted room sound in a recording, remove it with noise reduction rather than mask it with reverb.
Pro Tips
- Always apply reverb and delay on a send/return (aux) channel, not directly on the track insert. This lets you control the wet mix with the send level and use one reverb instance for multiple tracks — saving CPU.
- High-pass filter your reverb return at around 100–150Hz. Bass frequencies in reverb tails create mud fast — cut them and your mix will be cleaner immediately.
- Automate reverb sends — increase the wet level on the last word of a phrase, lower it at the start of a new phrase. This is a standard pop production technique for vocal presence without constant wash.
- Free options: Valhalla Supermassive (reverb/delay, free), OldSkoolVerb (free plate), TAL-Reverb (free algorithmic). All are high-quality and used by professionals.