A special - and somewhat unusual - value is 0, which means that the SID player should not continously call a replay routine, as the init routine itself never returns, but is handling replay on its own. This is generally only used in a few very special situations; e.g. in some tunes using digital samples.
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"