Options > Global MIDI
I’m sure you can take a look 
and search “Rig Manager”
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Many thanks Kenyan. Works great.
Audiofront who supplied the USB interface had a free app which I seem to have lost. Their web site has been down for a day or so, so I can’t download the app. Anyone know where I can get a copy of the free app please?
It’s ok. I just found it.