VD2: Saving clip with only 1 stream from dual audio?

[erodon]

With VirtualDub2, how can I select which of 2 audio streams I want to save? Source (mkv) has 2 audio streams (ENG/JP), and I only want one in my clip.
When I save a clip as-is, Movie Studio can't read the audio info so I all get is video.
(alternatively, is there a mod or an alt program that will let me pick which stream I want to save?)