I was kinda desperate with this until I ended up cleanly uninstall the Gigastudio160 and I realized that the performance tool didn't show the error message again.
Then I reinstalled the Gigastudio160 again with the latest version available in their web (ver2.54) and the VSL performance tool started giving me the "undefined external error" message again when I choose the Nemesys Midiout Port1 in the Performance tool.
My guess is that it might be a driver issue, but how to check?
Any body has any opinion?
Is it because I have K2 installed on the same machine?
Do I need Giga vst adapter?