[maxmsp] keyboard tracking / ampscale

micha skrev:
> hi there!
>
> does anyone have a formula for keyboard tracking, i.e. reducing the loudness with a increasing pitch? there is some function in super collider which is called ampscale which does exactly that, but i couldn't find any formula in the sources...
Hi,

if you're looking to build something advanced, have a look into Equal 
Loudness Contours, which would be the psycho-acoustic treatment of this. 
You should be able to suss the workings from this page, complete with 
loudness<->hz conversion graph:

http://www.sfu.ca/sonic-studio/handbook/Equal_Loudness_Contours.html


Hope this helps,
Andreas.