This is not some filter. This is THE filter.
There is plenty of special effects available on the Web.
There are even sold in bundles sold by thousands for a few USDollars.
The same applies to impulse responses of different interiors.
The used methods are not adequate to reconstruct acoustics of ancient theatres.
As an example take a look at the paper by Prof. Rindel and his team.
They first measured Reverberation Time (T30) for quite well preserved
ancient theatre in Aspendos and then tried to calculate these parameters
using a state-of-the-art software acoustic solution. The MAPE error is 13%.
The link to the paper is here.
I have constructed the filter using Vitruvius’ directions about building
the theatres suitable for musical performances supplemented by the data
about sizes and proportions of Epidaurus theatre. The solution has been granted
two PL patents, US and EU patent applications pending. Because of the
regularity of the ancient theatre form, the solution is easily implemented in
Python. To obtain the final effect it was important to use the very
detailed information about the form of the theatre and the propagation
of the sound in the materials of which theatre was built. The propagation
reconstruction model was devised using ‘path integral’ approach for the
transverse sound in the material.
It is great to work with FM Records, who discovered my solution not only
as technically correct, but also bearing the artistical contribution.
That is a joy when you can connect the wisdom of ancient engineers,
modern acoustic principles and artistical impressions and deliver
this edition of FM Records “Sound of Ancient Greek Theatres” to the public!
I hope you will enjoy it as much as I do!