Handling L/R stereo channels

[bilo1967]

Hi,

is it possible to get the audio of two mediastreams put the first audio in the L stereo channel, the second in the R channel (with no mixing or maybe specifying for each track a "balance", padding the lenght of the shorter track with silence, if needed) and save them in a wav file?

If the answer is yes, how could I achieve that?

Regards.

G.

P.S.
Basically I need as an output a stereo file where the L channel is in one language, the R channel is produced by an interpretation student in another language, and the teacher training that student may hear the original voice in one ear and the translation in the other, crossfading them as needed.