Peter,
Thanks, at least I understand now how the filter should work. But unfortunately it doesn't. There is clearly a real problem with the parser that incorrectly takes over the entered string. See screenshot:

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Biab/RB latest build, German Language Pak, Win 10/64 Pro, 1 TB SSD, 32 GB RAM. Notation SW Finale, StaffPad, SmartsScore – Playing Double Bass, Guitar, Piano