The package installs the VST2/VST3 plugins in the wrong directory (installs them to /usr/bin but should be /usr/lib/vst2 resp. /usr/lib/vst3).
Here's a PKGBUILD, which fixes this, among other improvements:
https://cpaste.org/?3142463654568164#GxV2BNqX6HH2YVVxYLtC5XkqpghNedFe1TXSYom2qJ6W
