Astroid

This is a curve with a fast decay at beginning and a slow decay at the end. The area of the curve is 29.85% of the full square area (-10.38 dB FSA).

If based on area ratio (current to Linear (50%), it’s RT60 time should be 0.61 of Linear RT60.

This curve was calculated from the Astroid Curve Equation ( https://en.wikipedia.org/wiki/Astroid )

3 UMD

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

It’s a general-purpose fast decay impulse, for vocals and instruments, or any electronic musical effect.

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 AST A Min 3 means 3 UMD White Noise as generator, AST as fall curve, A Minor as Tone and 3 seconds of Impulse length.

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

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

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

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

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

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

The files on the other folders follow the same syntax meanings