How to stop Logic Pro system sounds playing through midi'd Roland FA-08

This should be simple but driving me nuts. I've just midi'd up a Roland FA-08 to Logic Pro X (on Mac Mini USB) and setup the Audio/Midi configuration, all good. I am good to disable the Mac Mini system sounds from playing through my Roland. However, I'm not finding how to disable Logic Pro from sending system sounds as in opening a new project, or navigating menus, closing screens, changing between Logic tracks, arming record - when I arm a track to record, I'm getting a sound every time the bloody R flashes red!!

I get a piano bang or some string sound that is being sent to the Roland and back into my interface (Soundcraft Signature MTK 22). I've tried all the obvious settings in Logic and Audio/Midi settings but not able to find where to disable this - I've even tried to turn off all Roland MIDI Receive info and still coming through.

Help and Thanks!!