ATAreSYN is the resynthesizer belonging to ADDACTIVE.
It analyses 16Bit RAW file´s spectrum and saves them as ADDACTIVE-SPECTRUM-FILES. These files can be loaded in ADDACTIVE (fullversion).
Because the problem about additive synthesis is to add the right sinewaves with each other to achieve the disired sound.
There are two ways doing this, one is by trial and error, the other one is using an analysing tools which helps you finding the right sinewaves for a certain soundcharacter.
ATAreSYN is a tool which helps you in doing this.