You mean GoldWave. It's not that effective, but still a pretty good program. Depends on the quality and instruments of the music. Doesn't always remove the music from the vocals completely. I don't think there is a way to get the vocals as a separate file, as I've only noticed and experiemented with the remove vocals option. Effect->Stereo->Reduce vocals.
Give it a try. See what you can come up with.
