Ok, I have encoded about five of my videos into avi's that use IMA ADPCM as an audio codec and have them up on the site. I have finally realized that I should be using MPEG Layer-3, since not everybody's computer can play IMA ADPCM, and MPEG Layer-3 is supposed to do a better job anyway.
But now the problem is, I no longer have uncompressed versions of the audio. I have used voice-overs and such and have deleted the source files I used for them. Is there any way I can just stick my video in VirtualDub, make a direct stream copy of the video, and convert my audio to a different codec? I don't know how I would go about doing this... any tips?