I use the virus Ti plugin via vst host. When that vst plugin is loaded it creates a midi device (to send midi data to other parts,via channel 2-16).this device is not displayed in the eg cvc cv-midi plugin. Probably the midi device list needs to be refreshed after a vst plugin is loaded.
Are you sure it actually creates a MIDI device, or does it just have MIDI inputs through VST? Currently you can only send MIDI messages to a VST plugin on channel 1 using VCV Host.
On cubase it creates a selectable midi device to use with seperate midi track. But you’re right , that device is only visible in cubase. Would be a nice feature to send cvmidi to other vst midi channel.