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Sorry, there isn't really a way to do this. I suggest a couple workarounds on an old thread that might help, but none are really good solutions:
https://social.microsoft.com/Forums/en-US/151d8dcb-614b-4b48-b1f6-c68823becddc/feature-request-load-vocals-from-file-migrated-from-communityresearchmicrosoftcom?forum=songsmith
Sorry!