Thanks. That is indeed the problem. At 104.27% SoundForge is more than 2 seconds off of the correct length.

Using a time calculator it seems I am only getting 104.245%. SoundForge isn't too good at math it would seem.

It does have the ability to let you enter a final length. Good because there's more flexibility, bad because there's now an extra step of using a time calculator.

Edit: Hmm. Even entering a time directly it misses the target. Wt?

Any suggestions for another software that does the same thing?