[PD] isosonic curves : level the perceptual loudness of different pitches

[Denis Trapeznikoff]

2007/2/9, Ed Kelly <morph_2016 at yahoo.co.uk>:
>
> So, if you have a signal at 96dBPD (-4dBFS) and you set it to 90dBPD
> (-10dbFS), the loudness will be heard to drop by the same amount as when you
> then set it to 84dBPD (-16dBFS).

... but remember, that ear's frequency response curve is dependent on the
level of sound... So the amount is not "the same".
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