Reverb vs Delay
When to use reverb, when to use delay, and how to combine them in your mix. With BPM-synced delay time calculator for any tempo.
Reverb
Simulates an acoustic space. Adds diffuse reflections that decay over time. Makes sounds feel like they exist in a room, hall, or chamber. Creates ambience and blends elements together.
Delay
Creates distinct repeating echoes at a set time interval. Adds rhythmic interest, depth, and width. Can be synced to the tempo of the track for a tight, musical effect.
The Core Difference
The simplest way to think about it: reverb creates a space, delay creates a rhythm. Reverb is continuous, diffuse, and ambient. Delay is discrete, rhythmic, and repeating.
Reverb analogy: Clap your hands in a cathedral. The clap dies away slowly as reflections bounce off every surface. That's reverb, it's everywhere at once, all blending together.
Delay analogy: Shout "hello" across a canyon and hear "hello... hello... hello" come back at regular intervals. That's delay. Each repeat is a distinct copy of the original.
Reverb vs Delay: Full Comparison
| Feature | Reverb | Delay |
|---|---|---|
| Effect type | Room simulation (space) | Echo (repetition) |
| Sound character | Diffuse, blended, ambient | Rhythmic, distinct repeats |
| Timing | Continuous decay (no discrete rhythm) | Synced or fixed repeat intervals |
| Controls | Pre-delay, decay time, size, diffusion | Delay time (ms), feedback, mix |
| Space feeling | Yes, very strong | Minimal (adds depth, not space) |
| Rhythmic use | Not rhythmic | Yes, dotted eighth, quarter note, etc. |
| Dense mixes | Can muddy fast passages | Can clutter if not synced to BPM |
| Common on vocals | Yes, adds air and space | Yes, slapback or dotted eighth |
| BPM-synced | Partially (pre-delay only) | Yes, core feature |
| Feedback loop | Built-in (decay) | Adjustable (0 = single repeat) |
| Phase issues | More common | Less common |
| CPU load | Higher (convolution reverbs) | Lower (simpler algorithm) |
When to Use Each
Use Reverb
- + Adding room or space to a dry signal
- + Making instruments feel live and natural
- + Creating ambient pads and soundscapes
- + Blending elements into a cohesive mix
- + Simulating recording environments (hall, plate, room)
- + Adding tail to a vocal or snare without rhythm
Use Delay
- + Adding rhythmic interest (dotted eighth guitar)
- + Slapback echo on rock/country vocals
- + Width and depth without washing out the mix
- + Ping-pong stereo effect on synth leads
- + Doubling or widening instruments
- + Creating tempo-locked effects in electronic music
Use Both Together
- + Reverb after delay (delay feeds into reverb = lush tail)
- + Short delay to create a wider pre-reverb spread
- + Reverb on delay returns only (keep dry signal clean)
- + Parallel processing: delay for rhythm, reverb for space
- + Epic vocal treatments (U2, Coldplay, stadium rock)
- + Electronic pads with evolving spatial texture
Signal Chain: Delay Before or After Reverb?
This is one of the most debated mixing questions. The order matters a lot.
Each delay repeat gets its own reverb tail. The result is spacious, evolving, and lush. Each echo sounds like it's happening in the same room. Used by most engineers for vocals, guitars, and leads.
The reverb tail gets repeated by the delay. Creates a washy, smeared effect. Can be interesting for ambient music or special effects, but tends to muddy a mix in denser arrangements.
Rather than inserting reverb and delay directly on the channel, send the dry signal to two separate aux tracks: one for reverb, one for delay. This keeps the original signal clean and lets you blend the effects independently. You can also add a small amount of reverb on the delay return without affecting the dry signal's reverb treatment.
Common Delay Types
Use the Delay Calculator to find exact ms values for your BPM.
| Type | Time | Feedback |
|---|---|---|
| Slapback | 40-200ms | 0% |
| Dotted Eighth | BPM-synced | 20-40% |
| Quarter Note | BPM-synced | 30-50% |
| Ping-Pong | BPM-synced | 20-60% |
| Reverb Pre-Delay | 5-60ms | 0% |
Common Reverb Types
| Type | Decay | Pre-Delay |
|---|---|---|
| Room | 0.3-0.8s | 0-10ms |
| Hall | 1.5-4s | 20-60ms |
| Plate | 0.8-2s | 10-30ms |
| Spring | 0.5-2s | 0-15ms |
| Shimmer | 2-8s+ | 20-50ms |
Genre Guide: What to Use
Calculate BPM-Synced Delay Times
Get quarter note, dotted eighth, eighth, and 32nd note delay times for any BPM instantly. Includes reverb pre-delay values.
Open Delay CalculatorFrequently Asked Questions
What is the difference between reverb and delay?
Reverb simulates acoustic spaces (room, hall, plate) by adding diffuse reflections that decay over time. Delay creates distinct repeating echoes at a set time interval. Reverb adds space and ambience; delay adds rhythmic echo and depth.
Should I use reverb or delay on vocals?
Both are common on vocals. Delay (slapback 40-120ms or dotted eighth) adds depth and width without washing out the vocal. Reverb adds space and a natural room feel. Many engineers use a short delay into reverb for a lush but controlled vocal effect.
Should reverb come before or after delay in the signal chain?
Delay before reverb is the most common approach. The delay repeats each get their own reverb tail, creating a more spacious, evolving sound. Reverb before delay creates a washy, smeared effect that can muddy a mix.
How do I sync delay to BPM?
Use the formula: delay time (ms) = 60,000 / BPM for a quarter note. For a dotted eighth note, multiply by 0.75. For an eighth note, multiply by 0.5. Use the BeatKey Delay Calculator to instantly look up delay times for any BPM and note value.