audition "Remix" using JSX

I want to use script to remix an audio file, but i do not find an API function to call.

var file = new File('D:/Projects/VideoSyncMusic/remixtest/Untitled Session 1/Untitled Session 1.sesx');
var docOpenParam = new DocumentOpenParameter(file.fsName); // Audition specific Open Parameter
var sesDoc = app.openDocument(docOpenParam); // Opens the file in Audition
var current = app.activeDocument; 


app.invokeCommand(Application.COMMAND_CLIP_ANALYZEFORRETARGETING);

//------
// code here to to change the duration
//------