The Art of Creating Space: A Guide to Reverb

No sound should be homeless – just as no creature should be homeless. Every sound in your productions deserves to live in a space. What has always fascinated me about electronic music production is the ability to create and place sounds in spaces that either mimic reality or exist entirely outside our normal frame of reference.

When I first heard those "unreal" sounds on the radio as a kid – sounds that seemed to come from another universe – I was captivated. What kind of spaces did they inhabit? How could something sound so foreign yet so captivating?

At Rumkraft, we named ourselves after this very concept: rum + kraft (space + power). Space is fundamental to all music – and with computers, we've gained the ability to create spaces that don't just imitate reality, but transcend it.

Architecture Shapes Music

In his book How Music Works (2012), David Byrne presents a fascinating theory: music adapts to the spaces it's played in. It's not the music that comes first – it's the architecture.

"I'd like to propose that music [...] evolved to fit the spaces available."

The Cathedral and Choral Music

Consider the European cathedral with its massive stone walls and vaulted ceilings. The reverberation time can be 5-10 seconds or more. In such a space, fast melodies and complex rhythms make no sense – the sounds blur together into mud. But slow, sustained tones? They flourish. Gregorian chant and choral music developed precisely because the cathedral's acoustics favored it.

The organist in a cathedral plays with great care – each chord change must wait until the previous one has died away. The music is slow out of necessity, not choice.

The Tribe and Rhythmic Music

Compare this to outdoor music in African or Caribbean traditions. No walls, no reverb – the sound disappears into the air. Here, rhythms can be complex, polyrhythmic, overlapping. Sharp transients and percussive sounds cut through. The music evolves to fill the space in an entirely different way.

Byrne notes that this isn't just about culture or tradition – it's about physics. The space came first; the music adapted.

CBGB and Punk

A modern example: CBGB, the legendary punk club in New York. A small, dry room with minimal reverb. Here, the Ramones could play at breakneck speed, and the lyrics could still be understood. Punk's aesthetic – raw, direct, fast – was partly a product of the room's acoustics. In a cathedral, it would sound like chaos.

What Is Reverb, Really?

Before we dive into digital reverb, let's understand what physically happens when sound fills a space.

When you clap your hands in a room, several things happen almost simultaneously:

1. Direct sound: The first sound that reaches your ears – the shortest path from source to listener.
2. Early reflections: The first echoes that bounce off the nearest surfaces (walls, floor, ceiling). These typically arrive within the first 50-100 milliseconds.
3. Diffuse tail: After the early reflections, sounds begin to reflect again and again, mixing together, creating the characteristic "room sound" that gradually dies away.

Think of it as throwing a ball in a room and hearing it bounce. The first bounce is clear and directional. But after many bounces, the movement becomes chaotic and diffuse – you can no longer hear the individual reflections.

Key Reverb Parameters

The Digital Revolution: Spaces on Demand

Simulating an acoustic space with computers is one of the most fascinating challenges in sound design. In 1961, Manfred Schroeder published a seminal paper that laid the groundwork for algorithmic reverb. Since then, engineers and musicians have refined the art.

Sean Costello of Valhalla DSP – creator of some of the most beloved reverb plugins – describes the four fundamental building blocks of digital reverb:

The Four Building Blocks

1. Delay Lines: Memory that stores sound and plays it back after a certain time. This is the foundation for all echoes and reflections.
2. Filters: Control how different frequencies behave over time. High frequencies typically die out faster than low frequencies in real rooms (absorbed by surfaces).
3. Modulators: Subtle variation in delay times and other parameters that make the space "alive" and avoid metallic artifacts.
4. Simple math: Addition, subtraction, and multiplication combine signals and control levels.

Allpass Filters and Schroeder

One of Schroeder's brilliant insights was the use of allpass filters. These filters don't change the frequency balance of the sound (hence "all-pass"), but they introduce complex delays that increase echo density. It's like adding more "bounces" without coloring the sound.

Jon Dattorro from Stanford CCRMA has written the definitive academic text on reverb design. His "plate reverb" algorithm from 1997 is still used as a reference today.

Feedback Delay Networks

Modern reverb algorithms often use Feedback Delay Networks (FDN) – a network of delay lines that feed each other in complex patterns. This creates the dense, diffuse tail that characterizes natural spaces. Valhalla's Part 2 dives into these techniques.

Spaces You've Never Heard: Out of This World

This is where it gets really interesting. With digital reverb, we're not limited to imitating existing spaces. We can create spaces that cannot exist in the physical world.

Non-Euclidean Spaces

What if a space were infinitely large yet intimate? What if high frequencies lived longer than low frequencies (the opposite of reality)? What if the space had negative dimensions? Digital reverb gives us the power to break the laws of physics.

Shimmer Reverb

A classic "impossible" effect: the reverb tail is pitch-shifted an octave up (or down) in the feedback loop. The result is an ethereal, almost choral quality that grows in intensity. Brian Eno and Daniel Lanois popularized this technique in the 1980s. The sound doesn't exist in any natural space – it's pure imagination made audible.

Granular Reverb

In granular reverb, sound is divided into microscopic "grains" that are scattered in time and space. The result can be anything from subtle texture to total chaos – as if the sound were being scattered like dust across the universe.

Practical Guide: Give Your Sounds a Home

Enough theory – let's apply it. Here's a practical approach to thinking spatially in your productions.

Step 1: Decide What Type of Space

Ask yourself: Where does this sound live?

• Intimate space: Vocals close to the listener, as in a car or bedroom. Short decay, tight early reflections.
• Natural space: A studio, concert hall, church. Believable and recognizable acoustics.
• Impossible space: Dreamy, surrealistic, beyond our experience. Here you can break the rules.

Step 2: Choose the Right Reverb Type

Step 3: Adjust Decay to Tempo

As a rule of thumb: the reverb tail should "clear out" before the next beat or phrase. In fast music (140+ BPM), this requires short decay. In slow ambient, the tail can live for many seconds.

Step 4: Use Pre-Delay for Depth

Pre-delay is your secret weapon for placing sounds in space without losing clarity. 20-50ms pre-delay keeps vocals "in front of" the reverb. Longer pre-delay (80-120ms) creates a sense of distance.

Tips for Ableton Live

• Reverb (stock): Solid all-around reverb. Use "Quality" on "Eco" during production to save CPU.
• Hybrid Reverb: Combines convolution (IR-based) with algorithmic reverb. Fantastic for unique spaces.
• Convolution Reverb Pro (Suite): Import your own impulse responses from real spaces.

From Kingston to the Cosmos

David Byrne was right: architecture has shaped music throughout human history. But now we have the ability to transcend architecture. We can create spaces that don't exist – and place our sounds in them.

That's what draws me to electronic music production: the ability to create something "out of this world." Not just new sounds, but new spaces. Not just music, but entire universes of sound.

So next time you add reverb to a sound, ask yourself: Where does this sound live? In a cathedral? In a forest? In a space that cannot exist? Give your sound a home – and let the space shape the music.

Sources

• David Byrne, How Music Works (2012), Chapter 1: "Creation in Reverse"
• Jon Dattorro, "Effect Design Part 1", CCRMA Stanford
• Sean Costello, "Getting Started with Reverb Design", Valhalla DSP