It's important to understand the difference between Virtual Devices and Multitrack on the RØDECaster Pro II and RØDECaster Duo.
Virtual devices with the RØDECaster Pro II and RØDECaster Duo deal with separating audio already inside your computer from different software applications. A multitrack output deals with sending separate audio channels from the mixer to be recorded, usually from physical inputs. One is software-based routing, the other is hardware-based routing.
Please note: Virtual Devices offer powerful routing capabilities, making them ideal for users with complex audio setups. However, they might be unnecessary for everyday use of the RØDECaster Pro II or Duo. If you don't need to route audio between different applications, you likely won't need Virtual Devices.
For more information about RØDECaster Pro II & RØDECaster Duo, please see our RØDECaster Pro II User Guide and RØDECaster Duo User Guide