I am trying to join two mpegs to burn as one vcd, but when i use TMPEGEnc to join them the sound doesn't come out right. Is there a way to get this right?

an option i thought about was ripping the sound off the separate mpegs and them combining them together, then multiplex it back with just the video portion of the combined mpegs. But i don't know what i can use to combine the two wav files?