There is no such software that does such a task as that..both voices will have the same requency responses so taking one out will adversly affect the sound quality of the other.
I think the only software that might even come close to doing that is Sonic Solutions and that's quite expensive!!!
Opus

David,

If the two voices aren't talking together, then simple waveform editing might work. If the program material is long, well then, it depends on what its worth. You will most probably have to run the result through some sort of non-obtrusive ambience (short reverb) to even out the cuts.

However, if the voices are talking simultaneously anywhere, all bets are off.

Yorik

Thanks for the help guys. i had doubts about this being possible but if it was out there, hell, why not.

david