Neper

 

This is a curve with a very slow decay atStart 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

 

3 UMD

 

3 UMD means that each frequency of the chord was faded out at a different speed, using the sequence Up-Mid-Down.

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, 2 folders Major and Minor, having 16 Impulse files each, in a total of 1152 Impulse files, with the following folder structure:

 

Wave Naming

 

3UMDWN Neper A Min 3 Means 3 UMD White Noise as generator, Neper as fall curve, A Minor as Tone and 3 seconds of Impulse length.

 

3UMDWN Neper A Min MS 3 The same as previous but with an M/S building processing.

 

3UMDWN Neper A Min 6 Means 3 UMD White Noise as generator, Neper as fall curve, A Minor as Tone and 6 seconds of Impulse length.

 

3UMDWN Neper A Min D2Oct 3 D2Oct means 2 octaves down.

 

3UMDWN Neper A Min D2Oct MS 3 the sane with M/S processing.

 

3UMDWN Neper A Min DOct 3 DOct means one octave down.

 

3UMDWN Neper A Min Oct 3 Oct means one octave up.

 

The files on the other folders follow the same syntax meaning