As part of the research for my immersive projects and performances, I am trying to better understand the visual and audio aspects of XR experiences. In that context, I attended the Immersive Music Day at PXL in Hasselt, Belgium, organized by the PXL Music Research team. The full program, schedule, and lineup are here.
It is a relatively small-scale event (I guess about 100 PAX), which is great as it enables networking with the participants and the speakers. The event was held at a location with great immersive audio infrastructure (3 rooms with full 360 sound set-up). For the rest, it was a no-frills event with super-friendly staff and good food at breakfast and lunch.

I was also pleasantly surprised by the mix of ages, ranging from fresh-faced high school students to seasoned audio veterans and legends, plus corporate fossils like myself. That kind of diversity usually signals that something truly interesting is about to unfold.
But the best part was the content and the speakers.
If there was an intended or unintended theme, it would be the subjective aspects of the immersive experience (how sound “feels”, or about the experiential coherence of auditive, visual, and spatial input) vs. the technological aspects of immersive sound (like precise localisation of sound in space). But I am sure that in some other sessions, the content was quite nerdy, up to the detailed coded and mathematical aspects of encoders/decoders.
Here are a few notes and reflections from the sessions I attended.
Immersive Space – An Agent for Creating and Experiencing Music
Speaker: Wieslaw Woszczyk, Director of the McGill Recording Studios and the Laboratory of Virtual Acoustics Technology at the Schulich School of Music of McGill University.
Program synopsis: Humans have sensory capabilities for recognizing their presence and immersion in space. Music ideally matches these capabilities by presenting dynamic, tonal, harmonic, and rhythmic structures in sound. Musicians use space to generate and blend sounds of ensemble, to hide and reveal musical voices, to dramatize perspectives, and to harness emotion in music making and listening. The talk explores immersive space as a modern technological tool for augmenting people’s experience of music

Notes:
I had never considered immersive sound as a medium for live music performance—being physically present in one space while listening to live musicians through a 360° sound system that simulates the acoustics of an entirely different environment. Wieslaw talked about auditory “fingerprints” of spaces. This goes way beyond sound effects like reverb that simulate the reverb of a cathedral. No, this fingerprint captures the full acoustic character of a space—every corner, every height, every nuance. And there are plug-ins available that let you import this detailed acoustic profile directly into consumer-level digital audio workstations like Logic Pro and others.
This allows performing artists to shape and test their artistic expression for a specific space, like the San Francisco Cathedral, or lets the audience experience the music as if they were actually there, immersed in that very acoustic environment.
Altering the Immersive Potential: The Case of the Heilung Concert at Roskilde Festival
Speakers: Birgitte Folmann, Head of Research, Sonic College, and Lars Tirsbæk, Consultant in Sound & Emerging Technologies, Educator 3D audio, Sonic College
Program synopsis: Immersive concert experiences are often described as specific, emotionally moving, dynamic, and complex – qualities that require experimental and interdisciplinary methods to be meaningfully understood. In this talk, we explore the immersive and engaging potential of live concerts through the lens of the Heilung performance at Roskilde Festival. Drawing on anthropological fieldwork and insights into the technical systems that supported the experience, we discuss how a deeper understanding of immersion can inform both artistic and technological development to enhance future audience experiences
Notes:
The talk was about the Heilung Concert at Roskilde Festival in 2024, in a festival tent holding about 17,000 people. Details about the technical set-up by Meyer Sound here.
What struck me was that the concert wasn’t branded as an “immersive” experience—there was no expectation set in advance. Yet, the immersion began the moment people entered the tent: birdsong filled the air, subtly blurring the line between environment and performance. It reminded me of my Innotribe days, where we also paid close attention to how people entered a space. After all, arrival and departure are integral parts of both the performance and the scenography.
The first part of the talk by Lars was about the technical challenges of delivering a 360 immersive sound experience in such a huge space. The second part by Birgitte was about the anthropological and subjective aesthetic experience of immersive music by the audience. Her slogan, “Aesthetics is a Verb” is great t-shirt material. They also talked about the “attunement” of the audience to the experience, and that you can’t fight the visuals: for example, when the drums play on the front stage, having the 360 sound coming from behind you does not work for the human brain.
Their team is now starting to document the findings of their field research. More to come.
Designing the Live Immersive Music Experience
Speaker: Paul Geluso, Music Assistant Professor, Director of the Music Technology Program – NYU Steinhardt University
Program synopsis: Paul Geluso’s work simultaneously encompasses theoretical, practical, and artistic dimensions of immersive sound recording and reproduction. His first book, “Immersive Sound: The Art and Science of Binaural and Multi-channel Audio,” published by Focal Press-Routledge, has become a standard textbook in its field. Geluso will share his research experience while providing exclusive previews of interviews and insights with featured immersive audio masters from his forthcoming book, “Immersive Sound II: the Design and Practice of Binaural and Multi-Channel Experiences” set to be published in fall of 2025. This presentation will also included discussions on his 3DCC microphone technique, a 3D Sound Object speaker design capable of holophonic sound playback, and his work on in-air sound synthesis and other site-specific immersive sound experience building techniques.
Notes:
Paul Geluso is God. Some years ago, he published “Immersive Sound: The Art and Science of Binaural and Multi-channel Audio,” considered by audiophiles as “The Bible”. He is also good friends with Flanders’ best artist, Piet Goddaer aka Ozark Henry, who specializes in immersive sound and music.

Paul took us on a journey of his research on immersive recording (making custom made 3D microphones and codes) and playback (making his own “Ambi-Speaker Objects”.

This was more of a backdrop for his upcoming book. While his first book was more about the how – the technology to record and playback immersive music – his new book will focus on the why – in essence, about leading with the story and the artistic intent. He hopes the new book will be out in 2025.
I had the chance to have a short 1-1 conversation with Paul, who seemed interested in our immersive performance ideas, which was exciting to know.
Subjective Evaluation of Immersive Microphone Techniques for Drums
Speaker: Arthur Moelants, Researcher PXL-Music
Program synopsis: When presenting a group of listeners with four immersive microphone techniques in two songs, will they always choose the most objectively correct one? An experiment with drum recordings in different acoustics and musical contexts challenges the assumption that objective parameters like ICTD and ICLD should always determine the best choice. While non-coincident techniques often score better in these metrics, listener preferences can shift depending on the musical context, as other techniques offer different sonic and practical qualities that might benefit the production more.

Notes:
Arthur is part of my team for our immersive performances, like The New New Babylon, where he acts as both a cinematographer and immersive music expert. He is a member of the PXL-Music Research team. I was curious to see how he’d handle public speaking and delivery, and he did not disappoint. I’m always impressed by how some young professionals manage to blend deep, almost nerd-level technical expertise with polished communication and presentation skills.
His talk was about his research on the subjective experience of drums, and how that experience differs depending on the recording technique and on the context of the drums as part of a song. I really like the simple graphics of his slides to explain some quite technical aspects of immersive music. Not an easy talk to deliver as he was also giving live demos on a 360 system to let us hear the subtle differences.
That’s it. Hope you enjoyed these notes
Warmest,
















































