Allow me to rephrase that.
I have audio connected to video.
I exported that audio to other software to clean it up.
I re-imported it into Final Cut cleaned up and lined it up. So now, there are two copies of the same audio, one the original attached the the video, one the cleaned up version.
I turn the original all the way down to -infinite dB. It’s there as a guide track only, in case I later learn something isn’t clean enough or otherwise need the original audio.
Is it going to take up space in the export, despite it being turned down completely, because it’s still there?