I used to think that any plugin could be used in XTC, as it was inserted into a Multi-FX. I've changed my mind having problems with 2.04 devices in a Multi-FX in XTC mode. I found that often, that screwed up my project.
Maybe that's what Nikko means: that his effect can be safely inserted into a Multi-FX in XTC. Or else, I assume the XTC files would be included in the zip...
The Multicomp does have specific XTC versions of the device in the .zip file. And the readme file that comes with the VTube clearly states:
- PC users :
(if you want the XTC functionalities)
Unzip the 2 .DEV files with XTC in its name in the folder Pulsar/devicesXTC/Effects/Stereo/
Unzip the 2 .DLL files in your VST plugins folder, or in vstplugins/dadev/
(non XTC users can start here)
Unzip the 2 .DEV with no XTC in its name anywhere you want.