Cubase VST records from all active MIDI Inputs at the same time. In essence, this means you don’t have to care about selecting or activating MIDI Inputs. However, if you have multiple interfaces and want to deactivate an input for some reason, you can do this in the MIDI Setup System dialog on the Options menu.
• Which MIDI Inputs are available in the MIDI Setup System dialog depends on the settings made in the Setup MME application before launching Cubase VST, as described in the Installation booklet.
Each MIDI Track has a MIDI Output setting. This routes the data on the Track to a physical MIDI Output on one of your MIDI Interfaces.