Getting source of a track using Scripting

Hi

I try to extract every used soundtrack of a premiere pro project. I managed to iterate thouth all audioTracks and getting all clips (app.project.activeSequence.audioTracks[i].clips). But ExtendScript only show me some simple properties of a clip like duration, start and end. I would like to get also the source of the clip (ex. "Money sound.mp3"). Is there any way i can get that info? If i save the project file as xml that info seems to be included in every clipitem node.

I searched GitHub - Adobe-CEP/CEP-Resources: Getting Started with Adobe CC 2014 Extension SDK but couln't find a solution. It would be very nice go get en API overview what funtions are provided (as others here supposed).

Thanks a lot

HM