Hello, world!

January 27th, 2021: Orastron was founded.

We sponsor Audiomostly 2021

We are proud to sponsor the Audiomostly 2021 conference which will be held in Trento, Italy, 1-3 September 2021.

Supporting CIMIL

We sponsor the Creative, Intelligent and Multisensory Interactions Laboratory (CIMIL) at the University of Trento.

We participate to DAFx20in21

We are presenting two new scientific papers at the virtual DAFx20in21 conference on Wednesday 8 September 2021. Plus, there is more related news yet to be announced. Stay tuned.

What we do

We research music DSP algorithms and develop audio effects and virtual instrument plugins.

Virtual analog

This is our main area of expertise.

We measure, simulate, model, and implement emulations of entire analog and/or digital devices, whether synthesizers, effect pedals, or studio equipment.

Our extensive experience allows us to finely balance accuracy, resource usage, and effort according to application requirements and client requests.

Music DSP

We master several music DSP topics and techniques, including:

  • bandlimited oscillators and anti-aliasing;
  • wavetable and granular synthesis;
  • FIR and IIR filters;
  • delay-based and modulation effects;
  • dynamic processors;
  • distortions and waveshapers;
  • pitch tracking;
  • sound extrapolation;
  • resampling.

Other services

We assist our clients in related activities such as:

  • development of sound analysis and processing tools;
  • measurement and analysis of circuits, devices, and software;
  • independent revision of research, algorithms, software, and hardware products;
  • scientific research;
  • professional training;
  • professional opinions.

How we do it

Our daily activity is highly interdisciplinary and requires a wide knowledge in mathematics, physics, acoustics, electronics, digital signal processing, computer science, psychoacoustics, music theory, and music production.

We leverage scientific principles and state-of-the-art techniques in order to define, implement, and refine repeatable processes that yield solid results. At the same time we practice critical thinking to flexibly adapt our methods to the peculiarities of each project.

Orastron - How we do it

We greatly value automation as a mean to speed up development, reduce risks, assist with interactive tasks, and clarify the definition and implications of processes. We use standard tools when available and convenient, but for specific needs we have developed our own exclusive internal tools.

We continuously collaborate with universities and companies worldwide and invest substantially in research to advance the knowledge in our field. Here is a selected list of scientific publications we have authored.

Arbitrary-Order IIR Antiderivative Antialiasing

P. P. La Pastina, S. D’Angelo, and L. Gabrielli, 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.

Antiderivative antialiasing is extended to use arbitrary IIR filters for the virtual downsampling.

Optimal Integer Order Approximation of Fractional Order Filters

P. P. La Pastina and S. D’Angelo, 24th Intl. Conf. Digital Audio Effects (DAFx20in21), Vienna, Austria, September 2021.

A criterion and simple formulas are found to optimally place poles and zeros when approximating fractional order lowpass filters with integer order filters.

Fast Approximation of the Lambert W Function for Virtual Analog Modelling

S. D’Angelo, L. Gabrielli, and L. Turchet, 22nd Intl. Conf. Digital Audio Effects (DAFx-19), Birmingham, UK, September 2019.

It suggests reformulating expressions containing the Lambert W function in terms of the Wright Omega function and describes fast methods to approximate this last function.

Efficient Signal Extrapolation by Granulation and Convolution with Velvet Noise

S. D’Angelo and L. Gabrielli, 21st Intl. Conf. Digital Audio Effects (DAFx-18), pp. 107–112, Aveiro, Portugal, September 2018.

It describes a novel and cheap method to extend the duration of audio signals without tonal coloration.

Emulation of Operational Amplifiers and Diodes in Audio Distortion Circuits

R. C. D. de Paiva, S. D’Angelo, J. Pakarinen, and V. Välimäki, IEEE Trans. Circ. Systems–II: Express Briefs, vol. 59, no. 10, pp. 688–692, October 2012.

It introduces the use of the Lambert W function for modeling single and antiparallel diodes in the wave digital domain.

Who we are

Stefano D'Angelo, D.Sc. (Tech.), Eng.

Founder · DSP maniac · plays bass

“After working on music DSP for over a decade, and as a freelancer for 3 years, I became firmly convinced that there is too much to know for a single person to achieve the best possible outcomes in this field. What I needed was a close-knit team of highly-qualified people with heterogeneous skills. That team now exists and it is called Orastron.”

Stefano D'Angelo, Founder

Pier Paolo La Pastina, Ph.D.

Mathematician · masters advanced geometry · plays keyboards
Tasks: DSP, device modeling, mathematics

Paolo Marrone, M.Sc.

Computer scientist · OS development enthusiast · plays keyboards
Tasks: coding, internal tooling

Luigi Li Bovi

Administrator · sales expert · plays guitar
Tasks: administration, legal representation


Orastron Srl unipersonale - Output

Alongside our custom services, we are currently developing software for internal and external use.
In particular, a library of high quality algorithms for sound synthesis and processing is in the works.

During the years our founder has contributed to several successful products for some of the best known companies in the music industry. Check his portfolio at dangelo.audio.


Get in touch!

If you want to know more, are curious about our work, have a question, request, or concern, feel free to get in touch with us. We're all ears.

Orastron Srl unipersonale
Via Pasquale Voso, 20/D
84043 Agropoli (SA)