Processing   

Processing refers to the treatment or alteration of a recorded sound. A wide variety of processors exist and have the ability to effect the signal passed through them in many different ways. 
 
The intent of processing a sound may be one of the following:
 
enhance spatial impression  remove noise or unwanted sound generate new sounds
reverb
delay 
chorusing 
equalization
noise-gates
compressors 
multi-effectors
SoundHack
Csound