@mwplugs
Open the "plugin" version with projucer
Skärmavbild 2021-07-15 kl. 09.38.59.png
In projucer, chose "Standard 64-bit" for all 4 versions of the plugin, Debug, Release, Debug MultiChannel....etc
Skärmavbild 2021-07-15 kl. 09.41.45.png
Save from projucer and open in Xcode, open the "Edit Scheme..."
Skärmavbild 2021-07-15 kl. 09.47.47.png
and make sure to change all options on the left side to the "MultiChannel version, so if "Debug" is ticked, change to "Debug MultiChannel", if "Release", change to Release MultiChannel
Skärmavbild 2021-07-15 kl. 09.47.23.png
Then you build as usual..