FO2 - A Laser Feedback Instrument with Bela Gem

Nicola Hein, and Viola Yip

Proceedings of the International Conference on New Interfaces for Musical Expression

Abstract

In "Fluid Ontologies", Transsonic (Nicola Leonard Hein and Viola Yip) continues to expand their intermedial artistic practice in performances. For this work, they further develop their DMI “FO2”. It is a laser-feedback-instrument that uses laser modules as sound sources and solar panel as microphones, creating audiovisual feedback loops, which create images and sound, using the same optoelectrical mechanism. The work is for two performers, each using one laser-feedback instrument. FO2 comprises two 3D-printed handheld controllers, a backpack with an embedded DSP system running on a Bela Gem and programmed in SuperCollider, and laser drivers. The laser drivers are controlled via their modulation input, using the Bela's analog output to modulate sound signals onto the lasers, effectively operating them as opto-electrical oscillators. We use solar panels as microphones to pick up the sound that is modulated onto the lasers and feed the sound back into the Bela audio input. This enables the mediality of feedback through light connection to be explored in ways that are entirely different from feedback circuits working in the audio domain only. Fluid Ontologies, using FO2, explores the embodiment and situatedness of musical performances through audiovisual instruments in a distinctive manner. Furthermore, by incorporating multichannel spatialization, Transsonic extends the spatial dimensions, both sonically and visually, creating a unique audiovisual experience. The project explores and defines new concepts of the instrumentality of light in audio circuits, putting space, body, technology, and instruments into one dynamic feedback system, exploring forms of cybernetic and transmedial modes of listening, as well as the emerging dances of agency.

Citation

Nicola Hein, and Viola Yip. 2026. FO2 - A Laser Feedback Instrument with Bela Gem. Proceedings of the International Conference on New Interfaces for Musical Expression. DOI: 10.5281/zenodo.20782128 [PDF]

BibTeX Entry

@inproceedings{nime2026_music_36,
 abstract = {In "Fluid Ontologies", Transsonic (Nicola Leonard Hein and Viola Yip) continues to expand their intermedial artistic practice in performances. For this work, they further develop their DMI “FO2”. It is a laser-feedback-instrument that uses laser modules as sound sources and solar panel as microphones, creating audiovisual feedback loops, which create images and sound, using the same optoelectrical mechanism. The work is for two performers, each using one laser-feedback instrument. FO2 comprises two 3D-printed handheld controllers, a backpack with an embedded DSP system running on a Bela Gem and programmed in SuperCollider, and laser drivers. The laser drivers are controlled via their modulation input, using the Bela's analog output to modulate sound signals onto the lasers, effectively operating them as opto-electrical oscillators. We use solar panels as microphones to pick up the sound that is modulated onto the lasers and feed the sound back into the Bela audio input. This enables the mediality of feedback through light connection to be explored in ways that are entirely different from feedback circuits working in the audio domain only. Fluid Ontologies, using FO2, explores the embodiment and situatedness of musical performances through audiovisual instruments in a distinctive manner. Furthermore, by incorporating multichannel spatialization, Transsonic extends the spatial dimensions, both sonically and visually, creating a unique audiovisual experience. The project explores and defines new concepts of the instrumentality of light in audio circuits, putting space, body, technology, and instruments into one dynamic feedback system, exploring forms of cybernetic and transmedial modes of listening, as well as the emerging dances of agency.},
 address = {London, United Kingdom},
 articleno = {36},
 author = {Nicola Hein and Viola Yip},
 booktitle = {Proceedings of the International Conference on New Interfaces for Musical Expression},
 doi = {10.5281/zenodo.20782128},
 editor = {Lia Mice and Nicole Robson and Tara Pattenden},
 issn = {2220-4806},
 month = {June},
 note = {Live Performance},
 numpages = {7},
 pages = {146--152},
 presentation-video = {https://www.youtube.com/watch?v=wUaUfmb6-i4},
 title = {FO2 - A Laser Feedback Instrument with Bela Gem},
 track = {Music},
 url = {http://nime.org/proceedings/2026/nime2026_music_36.pdf},
 year = {2026}
}