Video Editing stereo tracks I'm editing a video that needs a stereo effect (a sound moving from right to left) and I have the audio file without the effect. I just want to have two separate audio strips from that file for each stereo  (left/right) and fade the audio in each strip to accomplish the effect, but I can't find the way to indicate which strip corresponds to which stereo.

Is it possible to do that in Blender's Video Editing?.
In the Video Sequence Editor, add both audio clips.

On the left audio strip, set the Pan property to -1 under the Strip settings > Sound. On the right audio strip, set the pan property to 1.

Keyframe the Volume property (hover over it and press I to set a key) from 0 to 1 to make the audio fade from mute to 100% audible.



While this may work for some cases, I'd advise you to use a audio editing software (like the freeware audacity).