We have published some papers about our work. I’ll edit this post if more papers are added or third parties (you?) will write a paper about something involving our instrument.
Wegener and Neupert (2024): The Aliased Complex Oscillator as a Paradigm for Analog Physical Modeling Sound Synthesis. In: Proceedings … (to be published)
Wegener, Stang and Neupert (2022): FPGA-accelerated Real-Time Audio in Pure Data. In: Proceedings of the 19th Sound and Music Computing Conference, June 5-12th, 2022, Saint-Étienne
BibTeX citation
@inproceedings{wegener_fpga-accelerated_2022,
address = {Saint-Étienne},
title = {{FPGA}-accelerated {Real}-{Time} {Audio} in {Pure} {Data}},
copyright = {Creative Commons Attribution-ShareAlike License},
doi = {10.5281/zenodo.6572969},
abstract = {With the advent of fast ARM processors more audio products are running embedded Linux systems and using high level languages to implement real-time signal processing. Still, embedded Linux systems can’t compete with the processing power of desktop computers to implement complex signal processing as needed for physical modeling algorithms. This paper describes how to interface custom digital logic circuits in an Field Programmable Gate Array (FPGA) with the Linux operating system to speed up processing. The hardware used is a Terasic DE10-Nano development kit equipped with an Intel 1 Cyclone V SoC. We are running Pure Data (Pd) on Linux and communicating with a mass-interaction network for physical modeling sound synthesis on the FPGA. The code referenced in this publication is available online.},
language = {en},
booktitle = {Proceedings of the 19th {Sound} and {Music} {Computing} {Conference}},
author = {Wegener, Clemens and Stang, Sebastian and Neupert, Max},
month = jun,
year = {2022},
pages = {8}
}
Neupert, Wegener, Schmalfuß and Stang (2021): EXC!TE SNARE DRUM — Making an Audio Plugin with Pure Data inside. In: Revista Vórtex | Vortex Music Journal, Curitiba, v.9, n.2.
BibTeX citation
@article{neupert_exicte_2021,
title = {{EXC!TE} {SNARE} {DRUM} — {Making} an {Audio} {Plugin} with {Pure} {Data} inside},
volume = {9},
copyright = {Creative Commons Attribution-NoDerivatives 4.0 International License (CC-BY-ND)},
issn = {2317–9937},
url = {http://periodicos.unespar.edu.br/index.php/vortex/article/view/4547},
doi = {10.33871/23179937.2021.9.2.23},
abstract = {This report describes how we made a VST3 plugin containing Pure Data and integrated libpd into VCV Rack, iPlug2 and the VST3SDK. The plugin is a real-time snare drum synthesizer using an exciter-resonator model. We discovered an undesirable effect in Pd where the computationally cheap 4-point interpolation on delread4{\textasciitilde} creates audible artefacts, effecting our wave-guide. Our solution to this issue was to implement our own interpolation object based on advice from Cyrille Henry posted to the Pd mailing list in 2008. The implementation was taken from Julius O. Smith‘s Digital Audio Resampling reference book.},
number = {2},
journal = {Revista Vórtex {\textbar} Vortex Music Journal},
author = {Neupert, Max and Wegener, Clemens and Schmalfuß, Philipp and Stang, Sebastian},
month = nov,
year = {2021},
keywords = {interpolation, libpd, VCV Rack, VST3, wave-guide},
pages = {1--9}
}
Schmalfuß, Neupert and Kessler (2020): Efficient Snare Drum Model for Acoustic Interfaces with Piezoelectric Sensors. In: Proceedings of the 23rd International Conference on Digital Audio Effects (DAFx-20), Vienna: Vienna University of Music and Performing Arts 
Video of presentation
BibTeX citation
@inproceedings{schmalfus_efficient_2020,
address = {Vienna},
title = {Efficient {Snare} {Drum} {Model} for {Acoustic} {Interfaces} with {Piezoelectric} {Sensors}},
copyright = {Creative Commons Attribution-NoDerivatives 3.0 International License (CC-BY-ND)},
abstract = {This paper describes a computationally efficient synthesis model for snare drum sounds. Its parameters can be modulated at audio rate while being played. The input to the model is an acoustic excitation signal which carries spectral information to color the output sound. This makes it suitable for acoustic interfaces – devices which provide excitation signal and control data simultaneously. The presented synthesis model builds up on work done by Miller Puckette and processes audio input from a piezoelectric microphone into a nonlinear reverberator. This paper details a strikingly simple but novel approach on how to make use of the momentary DC offset generated by piezoelectric microphones when pressed to simulate the changes in drumhead tension. This technique is especially of interest for interfaces without pressure sensing capabilities. In the design process we pursued an experimental approach rather than a purely mathematical. Implementations of the synthesis model are provided for Pure Data and FAUST as open source.},
language = {en-US},
booktitle = {Proceedings of the 23rd {International} {Conference} on {Digital} {Audio} {Effects} ({DAFx}-20)},
author = {Schmalfuß, Philipp and Neupert, Max and Kessler, Björn},
year = {2020},
pages = {4}
}
Ehrhardt, Neupert and Wegener (2020): Piezoelectric strings as a musical interface. In: Proceedings of the International Conference on New Interfaces for Musical Expression. NIME. Birmingham: Royal Birmingham Conservatoire Video of presentation ( 
Awarded “Best Demo”)
BibTeX citation
@inproceedings{ehrhardt_piezoelectric_2020,
address = {Royal Birmingham Conservatoire},
title = {Piezoelectric strings as a musical interface},
abstract = {Flexible strings with piezoelectric properties have been developed but until date not evaluated for the use as part of a musical instrument. This paper is assessing the properties of these new fibres, highlighting their strengths and weaknesses for nime applications.},
booktitle = {Proceedings of {NIME} 2020},
author = {Ehrhardt, Marcel and Neupert, Max and Wegener, Clemens},
month = jul,
year = {2020},
pages = {2}
}
Wegener and Neupert (2019): Excited Sounds Augmented by Gestural Control. In: Proceedings of the 2019 International Computer Music Conference. ICMC. New York, N.Y: New York University
BibTeX citation
@inproceedings{wegener_excited_2019,
address = {New York, N.Y},
title = {Excited {Sounds} {Augmented} by {Gestural} {Control}},
copyright = {Creative Commons Attribution-NoDerivatives 4.0 International License (CC-BY-ND)}
abstract = {An acoustic interface to create excitation signals for digital resonators (waveguides, lumped models, modal synthesis and sample convolution) in synchronicity with augmenting control signals is presented. It is described how a direct acoustic excitation creates an intimate and intuitive interaction. Multiple prototypes and the lessons learned from them are documented in this paper.},
language = {en-US},
booktitle = {Proceedings of the 2019 {International} {Computer} {Music} {Conference}},
publisher = {New York University},
author = {Wegener, Clemens and Neupert, Max},
month = jul,
year = {2019},
pages = {5}
}
Neupert and Wegener (2019): Interacting with digital resonators by acoustic excitation. In: Proceedings of the 16th Sound & Music Computing Conference. Sound and Music Computing. Malaga
BibTeX citation
@inproceedings{neupert_interacting_2019,
address = {Malaga},
title = {Interacting with digital resonators by acoustic excitation},
copyright = {Creative Commons Attribution-NoDerivatives 4.0 International License (CC-BY-ND)},
isbn = {978-84-09-08518-7},
url = {http://smc2019.uma.es/articles/D1/D1_01_SMC2019_paper.pdf},
abstract = {This demo presents an acoustic interface 1 which allows to directly excite digital resonators (digital waveguides, lumped models, modal synthesis and sample convolution). Parameters are simultaneously controlled by the touch position on the same surface. The experience is an intimate and intuitive interaction with sound for percussive and melodic play.},
language = {en-US},
booktitle = {Proceedings of the 16th {Sound} \& {Music} {Computing} {Conference}},
publisher = {Universidad de Málaga},
author = {Neupert, Max and Wegener, Clemens},
month = may,
year = {2019},
pages = {80--81}
}
Neupert and Wegener (2019): Isochronous Control + Audio Streams for Acoustic Interfaces. In: Proceedings of the 17th Linux Audio Conference (LAC-19). Linux Audio Conference. Stanford: Center for Computer Research in Music und Acoustics (CCRMA), Stanford University Video of presentation
BibTeX citation
@inproceedings{neupert_isochronous_2019,
address = {Stanford},
title = {Isochronous {Control} + {Audio} {Streams} for {Acoustic} {Interfaces}},
url = {http://lac.linuxaudio.org/2019/doc/neupert.pdf},
abstract = {An acoustic interface (also: hybrid controller) is presented. By tapping, scratching, rubbing, bowing, etc. on the surface, excitation signals for digital resonators (waveguides, lumped models, modal synthesis and sample convolution) are created in synchronicity with augmenting control signals. It is described how a direct acoustic excitation delivers an intimate and intuitive interaction. Questions are raised about which protocols to use for isochronous audio and control transmission as well as file formats. Standardization of such protocols is desirable for future hybrid instruments with analog interfaces. A first step towards standardization is made with the publication of our implementation.},
language = {en-US},
booktitle = {Proceedings of the 17th {Linux} {Audio} {Conference} ({LAC}-19)},
publisher = {Center for Computer Research in Music and Acoustics (CCRMA), Stanford University},
author = {Neupert, Max and Wegener, Clemens},
month = mar,
year = {2019},
pages = {5}
}