options-preferences-midi devices

there is a list on the left and one on the right. Sounds like on the input side you have the USB MIDI connector enabled
If you enable it on the output side the midi will go out to your keyboard.

To test, **note what is highlited now so you can put it back later..

Then select the USB MIDI device to the yamaha and then click 'move selected device to top' button. If it is the only one highlited and at the top of the list, all midi tracks will go to the yamaha


I do not work here, but the benefits are still awesome
Make your sound your own!