Another angle: sometimes people mix up plugin names. For example, “TVST” might be a misremembered name. Maybe they meant “VST 59-031,” but that's not a standard naming convention. Alternatively, “TVST” could be a specific plugin or piece of software with a unique identifier in its name, like a sample library or synthesizer. If it's a sample-based plugin, maybe it's associated with a hardware unit or a software library.