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A VST/App implementation of the Higher-order Spatial Impulse Response Rendering (HO-SIRR) algorithm.
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Higher-order Spatial Impulse Response Rendering (HO-SIRR) is a rendering method [1], which can synthesise output loudspeaker array room impulse responses (RIRs) using input spherical harmonic (Ambisonic/B-Format) RIRs of arbitrary order. The method makes assumptions regarding the composition of the sound-field and extracts spatial parameters over time, which allows it to map the input to the output in an adaptive and more informed manner; when compared to linear methods such as Ambisonics.

The idea is that you then convolve a monophonic source with this loudspeaker array RIR, and it will be reproduced and exhibit all of the spatial characteristics of the captured space.

  • [1] McCormack, L., Politis, A., Scheuregger, O., and Pulkki, V. (2019). "Higher-order processing of spatial impulse responses". In Proceedings of the 23rd International Congress on Acoustics, 9--13 September 2019 in Aachen, Germany.

Pre-built plug-in and App

The plug-in and App may be downloaded from here [Mac OSX (10.10 or higher), Linux (x86_64), and Windows (64-bit)].

Building the plug-in and App yourself

First clone the repository (including submodules) with:

git clone --recursive
# or if you have already cloned the repository, update with:
git submodule update --init --recursive
git pull --recurse-submodules


The JUCE modules and VST2_SDK, must be placed in the 'SDKs' folder like so:


MacOSX, Windows and Linux (x86_64/amd64) versions: also require a custom Intel MKL library. Details on how to acquire this library may be found here.

Raspberry Pi (ARM) versions instead require OpenBLAS and LAPACKE libraries:

sudo apt-get update
sudo apt-get install liblapack3 liblapack-dev libopenblas-base libopenblas-dev liblapacke-dev

Linux (amd64/ARM) users must also install the following libraries (the former line for JUCE, the latter line for the Spatial_Audio_Framework):

sudo apt-get install x11proto-xinerama-dev libwebkit2gtk-4.0-dev libgtk-3-dev x11proto-xext-dev libcurl4-openssl-dev libasound2-dev
sudo apt-get install libhdf5-dev libnetcdf-dev libnetcdff-dev

Building the plug-in and App

When saving the .jucer files with the Projucer App, Visual Studio (2015/2017) solutions, Xcode project files, Linux Makefiles (amd64), and Raspberry Pi Linux Makefiles (ARM) are placed in:


To generate project files for other IDEs, you may open and configure the included .jucer files accordingly.

Building via script

Linux/MacOSX users may run the included "" script via the Terminal, to build the plug-in and App:

bash all

Windows users may run the included "build-plugin.bat" script (with "x64 Developer Command Prompt for VS.exe"), to build the plug-in and App:

build-plugin.bat <path/to/Projucer.exe>


  • Leo McCormack - C/C++ programmer and algorithm design (contact: leo.mccormack"at"
  • Archontis Politis - algorithm design
  • Ville Pulkki - algorithm design


This project is licensed under the GPLv3 License - see the LICENSE file for details

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