Check Options > Preferences > Midi Tab > Midi Devices. The Driver for your Roland needs to be at the top of the Output list as you are using port 1 and ports are numbered in order from the top of the midi Driver List. Also the Input Roland Driver will need to be checked. Make sure to UNCHECK the box "Re-Route Midi Output to the Default VSTi/DXi Synth". It is a long time since I used any external keyboard and I cannot now remember what the settings in the Midi Thru panel should be.

Lyn