HS066

This is a curve with a medium slow decay at beginning and a  very slow decay at the end. The area of the curve is 40.75% of the full square area (-7.8 dB).

If based on area ratio (current to Linear (50%), it’s RT60 time should be 0.81 of Linear RT60.

This curve was calculated from the Hyperbolic Secant Curve Equation, applying a value of 0.666666 as constant

https://mathworld.wolfram.com/HyperbolicSecant.html

https://archive.lib.msu.edu/crcmath/math/math/h/h424.htm

SMO

9 frequency bands were faded out, in the extension of 9 octaves, using 3 different Smoothed White Noise generators with delay to produce this set of impulses

It’s a general-purpose very soft slow decay impulse, for strong vocals and instruments, or any electronic musical source.

The collection is divided into  44.1 kHz 24 bit, 48 kHz 24 bit and 96 kHz 24 bit folders.

Inside each folder 12 tone folders (A to Bb).

Inside each Tone folder 3 folders of containing impulses of different source types.

In each inside folder we have 8 Impulses, in a total of 864 Impulse files, with the following folder structure:

Wave Naming

SMOO I WND HS066 A D2Oct 3 means SMOO I White Noise as generator, two octaves down Hyperbolic Secant 0.666666 as fall curve, A as Tone, and 3 seconds of Impulse length.

SMOO I WND HS066 A D2Oct MS 3 the same as previous but with M/S processing.

SMOO I WND HS066 A D2Oct 6 means SMOO I White Noise as generator, two octaves down Hyperbolic Secant 0.666666 as fall curve, A as Tone, and 3 seconds of Impulse length.

SMOO I WND HS066 A DOct 6 DOct means 1 octave down.

The files on the other folders follow the same syntax meanings