IMovie "Voiceover" how to adjust left

In imovies "Voiceover" I cannot adjust the left & right audio volume to simulate a voice comming from a specific direction. Using "o" the left & right volumn is shown without any means for adjustment.

Interesting question.  From the help info it seems that there is no way of handling left and right audio channels within iMovie 10.
I think you would have to record your voiceover outside of iMovie with an app which gives control over left and right channels then import that into iMovie.   This article suggests that Garage Band may be an option:
http://computers.tutsplus.com/tutorials/how-to-capture-and-record-audio-on-your- mac--mac-52196
Audacity may be another:  http://audacity.sourceforge.net
Geoff.

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