Opening a very old session (Ardour 2.?) fails with Ardour 6

Orm Finnendahl <[email protected]> Sat, 26 Jun 2021 21:45:37 +0200

Newsgroups	gmane.comp.audio.ardour.user
Organization	Hochschule fü r Musik und Darstellende Kunst Frankfurt, Frankfurt, Germany
Message-ID	<[email protected]>

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