City Sounds Blog Sound Design: An underrated lever for audience retention

Sound Design: An underrated lever for audience retention

In the opening sequence of A Very British Cult, the BBC podcast investigating a coercive “coaching company,” a faint, ominous tone drifts under a phone call before the main theme arrives. You may not register it consciously, yet you know that something alarming is about to be revealed. Then come snippets of voices to preview what’s ahead, and a pulse starts beneath the music, steady at first, then racing to match the rising tension. When the music theme finally breaks through, you’re already on edge. None of this is accidental; nothing in a production at that level ever is.

I pick up on these details because sound is what hooks me before anything else. My real rival for listening time isn’t other podcasts but music. But when a podcast dazzles with inventive sound design, it can win me over straight away because it makes me feel something.  

Thomas Chatterton Williams, writing in “The Atlantic”, had a different experience. He tracked his Spotify use for a year and found he spent about 49 days on the app, mostly listening to podcasts instead of music. He used to fill his commutes, workouts, and meals with songs, but podcasts now prevail. They “devastated my relationship to music”, he wrote alarmingly in his Podcast ‘Productivity’ Trap article.

Even though our listening habits differ (one chasing productivity, the other emotions), we see that music and podcasts compete for the same kind of close, portable attention. Music can envelop a listener without demanding full attention, whereas spoken audio requires active listening, yet both tap into the brain’s rapid, intuitive response to sound: auditory reaction times are consistently measured at 20–40 milliseconds faster than visual ones (Shelton and Kumar, 2010; Jain et al., 2015; Shaw et al., 2020). For podcasters hoping to capture those critical first minutes, sound design becomes the bridge that seizes attention.

The subtle hand of sound design

Theatre practitioners have well documented the impact of sound on the audience. Rob Summers, a sound designer with extensive stage experience, recounts a challenge he had with an emotional scene that felt flat until they introduced a subtle low-frequency hum beneath the dialogue. Effective sound design is often imperceptible precisely because it is working as intended. Summers refers to the atmosphere it conveys as “the invisible character in the play. It should be there, influencing everything, but not screaming for attention.”

The same principle applies in radio and podcasting. Sharon Hughes, a BBC sound engineer celebrated for her creative work in audio drama, explains that sound should “support the writing and help lead the listener through the story, whether that be emotional response or timeline. It should enforce, not necessarily direct.” When sound attempts to dictate how the audience should feel, it becomes heavy-handed and, paradoxically, less effective. The most effective design simply amplifies what’s already in the material, allowing emotion to emerge organically.

I’ve put this logic into practice in my own work, for instance when I sound designed poems for BBC Radio 4’s Between the Ears. For a scene in which the narrator visits his grandfather, I chose the cyclical hum of a washing machine to fill the space, hoping to evoke the rhythm of repetition and the way memories linger and circle back. In another piece, after a hollow, meaningless sexual encounter, I tucked the phrase “I don’t care how you feel” beneath the main voice before letting the sharp cry of a crow pierce through. Each sound was meant to deepen what was already in the writing.

You don’t need to be a composer (but you can be)

If you’re a producer intimidated by sound design, note that composing original music is not required to use sound effectively. Platforms such as Epidemic Sound, Uppbeat, and Pixabay provide quality tracks that can be licensed affordably. The BBC has been using Audio Network for production tracks for years, and independent producers now have access to comparable resources. What matters most isn’t where the sound comes from, but how it is deployed.

Sharon Hughes demonstrated this in a radio production about the composer Messiaen (Messiaen and the Birds, BBC Radio 3), where copyright restrictions meant she could use very little of his actual music. Instead of treating this as a limitation, she built an evocative sonic world by layering birdsong recordings, culminating in a “skyline” of birds at the climax. In the end, music and the natural world became one, and the creative constraint led to a result far more interesting than a straightforward solution would have allowed.

The Noiser network has been taking a different approach for flagship productions, creating original scores built to interact with recorded sound effects. For Titanic: Ship of Dreams, Olivier Baines began with music he composed and recorded, and wove in recordings of metal being hit with hammers, water, waves. Again these sounds remain just below conscious recognition but carry enormous physical presence (I recommend watching this video about their process).

Alice Boyd, a UK musician and sound artist, takes a similar approach. She blends field recordings, folk-inspired harmonies, and ambient electronics so completely that it magnifies nature and music simultaneously, inviting listeners to experience the world in new ways.

It starts with the recording

Sound design begins before post-production with how and where something is recorded.

For Wolf Valley, produced by Almost Tangible, this was a deliberate choice. Instead of booking a conventional studio, the team recorded outdoor scenes in Hampshire (not Scandinavia, where the plot is set, but in fresh air nonetheless). Indoor scenes were captured at the Fish Factory, a vintage London studio that looks more like a lived-in house than a recording booth. With its warren of rooms and decades of accumulated character and dust, it offers the kind of acoustic variation that conventional studios flatten out.

Scenes were performed physically, with actors moving through the space while Louis Blatherwick followed them with a microphone, capturing how voices naturally changed from room to room and among themselves. Location recording captures not just a sense of place, but the way people inhabit it, how voices change when actors are genuinely cold, crowded, or outside. That sense of presence is difficult to recreate convincingly in post-production. Almost Tangible documented the process on Instagram (1, 2, 3).

Broken Order on Drama on 4 (Radio 4, Saturday) was recorded in the same space. Directed by Tony Churnside and produced by Eloise Whitmore, who both run Naked Productions, the production demonstrates a clear understanding of how performance, recording, and sound design work together. The argument between the bishop and the nun lands with force because it was acted out physically. To capture the sound of nuns kneeling, Eloise asked every woman in the room to kneel with blankets draped as robes, the fabric moving against the floor. She then layered additional sound effects, drawn from online libraries and her substantial personal archive, to complete the world.

In both Wolf Valley and Broken Order, a recurring musical theme returns at key moments, creating continuity and a sense of emotional memory across scenes.

The psychology of that contract

In general, the choice of music enhances immersion and connects listeners with the emotions of those involved. A Very British Cult is perhaps the most forensic example of this I have encountered in recent podcast production. For instance, when the “7 Habits of Highly Effective People” concept is introduced, a brief, clichéd self-help tune plays as a subtle but pointed commentary. Throughout Jeff’s story in Episode 1, dreamy, meditative music creates an atmosphere that balances melancholy with hope. It also evokes imagery of sailing and lighthouses, which felt like an understated irony given that Jeff is a sailor and the organisation that ruined his dreams is called Lighthouse. When this same theme returns in the final episode, it provides a sense of emotional continuity and closure. The series is equally deliberate in what it withholds. Episode 8 breaks the usual pattern by omitting the “preview theme” that usually signals what comes next.  As the series finale, the return of Jeff’s theme becomes the closing gesture, a reminder of his journey rather than a promise of continuation.

What these approaches have in common is the psychological theory on which they are based: that human attention isn’t driven solely by novelty, but by unresolved tension and the promise of resolution. Bluma Zeigarnik’s  research demonstrated that we remember unfinished tasks more vividly than completed ones. In storytelling, this principle becomes the driving force. And in sound design, it takes shape via a theme that returns in altered form, a texture introduced early and understood later, a sound that accumulates meaning over time; these create patterns that listeners learn, anticipate and feel, building a sense of familiarity.

What this means in practice

For producers thinking about retention, the structural questions – where does the hook land, how quickly does the episode establish stakes – are necessary but need to be complemented with the question of sound: What does this piece feel like to be inside? Is there a sonic world listeners can inhabit, or just a series of voices? Is there a recurring musical or atmospheric element that creates continuity? Are location sounds being used to connect abstract ideas to real places?

None of this requires a large budget. What it needs is treating sound design as part of the editorial process from the beginning, rather than applying it at the end when everything else is finished. A practical first step is to bring your sound designer/recordist into your earliest production meetings, before scripting begins. Even a simple sound map alongside your outline that lists potential textures, recurring themes, or environments opens up possibilities that a last-minute fix never will.

If you want to take these thoughts further, try listening to a favourite podcast episode through the lens of sound design. Ask yourself: how is emotion affected by the audio choices? Where do music, atmosphere, or silence guide your experience? Note the moments where sound reinforces the story, then experiment by applying a similar approach to a short audio project of your own, or bring the question into your next production meeting. Practical analysis followed by experimentation is the surest path to developing a sharper ear for emotional architecture in sound.

This post draws on research undertaken as part of ongoing professional development in audience engagement and audio production. Sources include: Thomas Chatterton Williams, “The Podcast ‘Productivity’ Trap,” The Atlantic (December 2025); Rob Summers, “The Impact of Sound Design on Audience Engagement in Theatre,” robsummers.co.uk; reflections from BBC practitioners Sharon Hughes; attendance at the recording of Broken Order (Naked Production for BBC Radio 4); and close listening to A Very British Cult (BBC), Titanic: Ship of Dreams (Noiser), and Wolf Valley (Almost Tangible for BBC Limelight).

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