VST3 plugins can be run with any tool that is compatible with 64bit VST3 SDK (Examples: Reaper, Bidule, etc.). The two mentioned hosts are tested by the AWX team (Bidule 0.9771, Reaper v6.32). The current VST3 plugin version does not support multi instances, because of an internal hard coding of the socket server port (25001). This port is used by Amp2Srv to communicate with the Harman Global Tuning Tool, when sending the signal flow or tuning the object.