Multiple Audio Feed Slection

Hoping some BSPlayer guru can help me with this one:

How do you select which Audio feed BSPlayer uses?

Specifically, I have an AVI file (SVCD Format) with a movie soundtrack, and a commentary track as well. By default, BSPlayer is playing both at the same time.

Is this an issue with my codecs, or the player?

How can I play the audio track I want?

Thanks!