I've just started a visualisation plugin though the winamp interface ( struct winampVisModule )
In this interface I got acces to the spectrum value of the currently played music that it's just fine

But there's 2 weird difference between the behaviour of the vis in MM and in Winamp.
1) In MM I must wait 13 seconds before the plug ins receive any spectrum data.
2) The spectrum datas seems to be cropped and doesn't use the full range of the unsigned char.
Here a picture who reflect the difference between Winamp and MM
It's the spectrum of the same song at nearly the same moment and the Winamp result is the upper window.

Is it the normal behaviour of MM and is there any workaround to better mimic the Winamp result ?
Cheers