Sound Loudness detection

is that possible to call specefield event when sound is making loud?
like when you scream in steam microphone test. :v:

http://wiki.garrysmod.com/page/Player/VoiceVolume

i mean not the player’s voice, i mean loudness of sound like dubstep gun from SR4
if its possible

How are you grabbing the sound?

i dont know myself.

Not possible with GMod without gm_bass2

Where can i get it?

Use google maybe??