at the moment the program simply "debug" on console the keys/encoders from MIDI/MCP device.
With next version it will send CAT commands to another USB.
So the answer is: at the moment no connection to the DUO CAT, in a few days, with newer version,
both devices will be connected to two USB of the RPI, as you stated.
Regards and thank for the tests,
Giovanni - HB9EIK