What can I do by connecting this unit and a computer by USB?

There are the following three ways of use.
1. Start RMX-500 Plug-in in your composition application and use this unit as a RMX-500 plug-in controller.
2. Use this unit as an application controller using USB-MIDI.
3. Output sounds of this unit to a computer and input the sounds of the computer to this unit using the built-in sound card (USB stereo one input and one output).