No Sound with Dorico 4

[MarcLarcher]

Dorico 3.5 Missing VST Plugins in Play mode

Welcome to the forum, @scoremasters. Are you running Dorico 4 under Rosetta? That will be necessary for any VST plug-ins that are not yet Universal, i.e. that do not yet support the M1 architecture. Please see pages 51 and 52 in the Dorico 4 Version History PDF for instructions on how to run Dorico 4 under Rosetta.