Neper

This is a curve with a very slow decay at Start and a very fast decay at the End. The area of the curve is 60.53 % of the full surrounding square area (-4.36 dB FSA).

If based on area ratio to Linear area, it’s RT60 time should be 1.21 of Linear RT60.

This curve was calculated inserting the Euler number 2.718282 into a base 10 logarithmic equation.

Logarithm – Wikipedia

WPN

This collection was made by direct Fall from a mix of White and Pink Noise of default style Octave Curves.

Basically, used on percussive material as extra slow decay impulse (gate reverb style), or in 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 we have 8 impulse files, in a total of 288 Impulse files, with the following folder structure:

Wave Naming

WPN N_Nep A 3 Means 3 White and Pink Noise as generator, Neper as fall curve, A Minor as Tone and 3 seconds of Impulse length.

WPN N_Nep A MS 3 The same as previous but with M/S building processing.

WPN N_Nep A 6 Means White and Pink Noise as generator, Neper  as fall curve, A Minor as Tone and 6 seconds of Impulse length.

WPN N_Nep Oct A 6 Oct means one octave up.

The files on the other folders follow the same syntax meaning