Exploring Sonic Spaces: An Interview with Sound Artists Anni Nöps and Casimir Geelhoed

In the realm of sound art, where sonic materiality and space converge, Anni Nöps and Casimir Geelhoed, both sound artists, know their thing. Their collaborative work explores the intersections of sound, technology, and spatial experience. They have been invited to create a composition for Line AV 2.0 at the opening event on Plein 1940 of Conflux Festival 2024.

Line AV 2.0 is an evolution of Daan Johan’s earlier work Line. This multichannel installation fuses spatial sound with stroboscopic light, transforming the space it occupies into an abstract environment that challenges sensory perception. Designed as an open content installation, artists from various backgrounds are invited to contribute with new compositions, allowing the installation to continuously evolve. The duo’s ability to craft intricate soundscapes that engage listeners in a multi-sensory experience aligns perfectly with the experimental nature of Line AV 2.0.

Casimir Geelhoed, composer and software developer, and Anni Nöps, a sound artist and electronic composer, began their collaboration around eight years ago. Initially drawn together through their mutual interest in creating radio shows focused on nuanced listening, they have since expanded their practice to include sound performances and installations.

Anni’s work revolves around the concept of sound as an object that forms its own space. Whether through performances, fixed media compositions, or sound installations, she seeks to explore how sound can be perceived as a material presence in the environment. “I’m interested in how sound forms a space on its own,” she explains. “It’s about creating these immersive, almost tangible spaces that listeners can inhabit.” Casimir’s interests align closely with Anni’s, especially in the context of spatial sound. As a composer, he explores themes such as overstimulation and fragility and has worked intensively with spatial sound, often making use of self-developed software to expand his expressive possibilities. 

Interview by Mara Noto.

We met them during their micro-residency at Garage Rotterdam to talk about the challenges and opportunities of working on Line AV 2.0.

“The constellation of the installation is unique, with 24 speakers and 24 lights not arranged in a conventional surround field but placed more frontally towards the audience,” explains Anni. “This creates a different way of being inside the sound space, especially with the reactive lights that follow each sound source.”

“We’re still testing the software, how to control the lights and how they react to the sound,” adds Casimir. “It’s a process of simultaneously developing further the tools and experimenting with the possibilities they offer.”

Working outdoors presents its own set of challenges, particularly in terms of sound design. The project’s location—Plein 1940, with Rotterdam’s soundscape and skyscrapers in the backdrop—adds to the complexity. Casimir especially expressed his excitement about this aspect, noting, “Being outdoors and part of the cityscape adds a new layer to the experience. It affects the type of material we use and how we adjust our composition to harmonize with the environment.”

Anni specifies: “We can’t use the most delicate sounds because they’ll be lost in the cityscape.” The presence of skaters, passersby, and the everyday hum of the urban environment will inevitably interact with their performance, creating a symbiotic relationship between the installation and its surroundings.

As Anni and Casimir continue to refine their composition, they remain focused on the performative aspects of the installation. Decisions about which elements will be controlled live and how the light composition will interact with sound are still evolving. The final tweaks will take place on location. So far, their experience with the system has informed their approach, but they plan to incorporate new material based on the insights from the micro-residency in the final performance in September.

The opening event will happen on Thursday 19.09 at the Plein 1940 square. The event is free of charge

‘Line-AV 2.0’ is an audio visual installation created by Macular. ‘Line-AV’ is a commissioned work by Klankvorm and made possible with the support of Creative Industries Fund, Mondriaan Fund, Fonds21, Stichting Bevordering van Volkskracht and the City of Rotterdam.

 

Anni Nöps

Anni Nöps is a sound artist and electronic composer based in the Netherlands.

Her artistic practice explores sonic materiality through live performances, fixed media compositions, and spatial sound installations. Her sonic palette is tactile and visceral, interlacing floating melodies and organic textures. In her performances, she crafts aural landscapes threading through delicate compositions, dense subs and ghostly drones.

She has performed and presented her sonic works at Europe-wide at museums, galleries and festivals such as Stedelijk Museum Schiedam, arebyte gallery (London), Institute for Computer Music and Sound Technology (Zürich), FIBER Festival, Sonic Acts (Amsterdam), Rewire Festival (the Hague), de Doelen Concert Hall (Rotterdam) and Stuttgart Ballet. In addition to her solo projects, she co-hosts radio shows and co-organises experimental music event series Field of Fictions in Amsterdam, together with Casimir Geelhoed.

She has received grants from Stimuleringsfonds Talent Development programme, Estonian Cultural Endowment, Art Office Rotterdam, Goethe-Institut Germany, and Nordic Culture Point.

Casimir Geelhoed

Casimir Geelhoed (NL, 1995) is an electronic musician, composer and software developer who explores expressive relations between software and sound.

Recurring themes in his musical work are overstimulation, introspection and fragility. Often making use of self-developed software, he is interested in the poetic potential of sound material transformed through digital means.

Geelhoed has created performances and installations for various festivals, including CTM Festival, Sonic Acts, Rewire, Fiber Festival, SPATIAL and Aural Spaces. He released music on the labels Janushoved, Posh Isolation & Post Hoc.

He has followed education in computer science, composition, music technology and sonology at the University of Amsterdam, the Royal Conservatory of The Hague and the Utrecht School of Arts.

Casimir Geelhoed is a main software developer of 4DSOUND, an Amsterdam-based studio exploring spatial sound as a medium. He has also been technical director of spatial sound venue MONOM in Berlin.

Programme 2024

Alberta Balsam
Line-AV 2.0 performance at Plein 1940
Alberta Balsam
Composition for Line-AV 2.0 at Katoenhuis
Bogna Konior
at Arminius
C. Lavender
at WORM
Casimir Geelhoed & Anni Nöps
Line-AV 2.0 performance at Plein 1940
Cecile van Bruggen (moderator)
at Arminius
DJ Shahmaran
at Perron
Edwin van der Heide
LSP at Brutus
Eric Parren (moderator)
at Arminius
feedbacksociety
BrKpCm at Brutus
Fronte Vacuo
MμRMUR: The Deer at Brutus
Fronte Vacuo
MμRMUR: The Deer at Katoenhuis
Heleen Blanken & Aho Ssan
at Brutus
Heleen Blanken (artist talk)
at Arminius
Jeroen Alexander Meijer
The Pendulum Always Swings Back to Stillness at Katoenhuis
Klara Ravat & Saåad
A-Hora at Katoenhuis
Lavender Suarez (artist talk)
at Arminius
Legowelt
at Perron
Macular
Line-AV 2.0 at Katoenhuis
Marco Broeders & Julian Edwardes
The Open Loop at WORM
Mariska de Groot & Dieter Vandoren
LFS2 at Katoenhuis
Mint Park
Composition for Line-AV 2.0 at Katoenhuis
Nicky Assmann & Joris Strijbos
Parallel Strata at Katoenhuis
Nkisi
at Perron
NVST
at Perron
Peter van der Putten & Maarten Lamers, supported by Daniel Simu
at Arminius
Renzo van Steenbergen & Kristjan Pütsep
Portaal at Katoenhuis
Resina
at Brutus
Roly Porter
at Brutus
Sabrina Ratté
Floralia (adapted version for SVNSCRNS) at Katoenhuis
Sara Persico
at Brutus
Talismann
at Perron
Thomas Moynihan
at Arminius
Zalán Szakács & Teresa Winter
Lichtspiel: Ars Anaclastica at Plein 1940
Zalán Szakács (artist talk)
at Arminius
Zohar & Jeisson Drenth
Hybrid AV performance at Brutus

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