Well, I understand now why it sounds so bad. It was recorded in C and the song is now in Eb, but there is an audio recording playing along in the key of C.

Look in the same folder that you saved the original .SGU or .MGU file and try to find a file with the same name but with the extension of .WAV or similar. Delete or rename that file. Restart BiaB and reload the song and you should be good to go.

I can't explain exactly what happened to create the audio file, but it was probably a step taken somewhere.

Incidentally, this does not compute:

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"The screenshot I uploaded now is from my original song key (C)"

So the original song was in C, including the RealTracks and the Audio Track

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After I transposed to Eb and things sounded OK with the audio track muted, I saved the song with a name including Eb.

So far so good. RealTracks are now in Eb, and the muted Audio Track is in C.

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If I mute the audio track all sounds OK and it's playing the song in C.

Wouldn't the song now be playing in Eb ?

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If I mute the RealTracks, all sounds OK but it's playing the song now in Eb.

Didn't you transpose the RealTracks to Eb? So with the RealTracks muted, the Audio Track is still playing in C, surely?

I suspect you've got these last two items reversed. The Audio Track is in C, the RealTracks are in Eb

At any rate, find the WAV file (or other audio file) in the same folder with the same name as your song and delete it. Restart BiaB and hopefully this will be resolved.

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