A special value is 0, which means that the initialisation address is not explicitly defined in the header, but rather coinsides with the load address of the file (i.e. if the music is loaded at address $1000 (= #4096), this address will also be called for initialisation).
This switch is mandatory when adding header to a file.
Example: psidTool.EXE Alien.C64 *.SID -a /i$1000 /p$1003 -title:"Alien" -author:"Mads Orbesen Troest (Hobbit)" -copy:"1992 Artificial Arts, LASER Inc"