Open goldwave, open your music file first
Then open your vocal file, or open a new empty file and use goldwave to record your vocals
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Then select all the vocals, copy them, in the menu bar: Edit->Mixing
That’s it, you can also make rough adjustments
If you want to The vocals completely fit the music, so it’s best to use software like cool
edit, because goldwave only supports single-track production, and you need other larger software for multi-tracks