In relation to the guitar track....

It sounds like you might have a rendered audio file attached to the song file and that this is playing along with the file and masking the guitar change. That would certainly produce the results you give (including how the track sounds fine in the Melody or Soloist positions).

To check this, click on the Audio menu in the uppermost main tool bar and select 'Mute'.

Regards,
Noel

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MY SONGS...
Audiophile BIAB 2024