Hey Gary, thanks for your help!
I have created a Software Instrument track and then in the inspector I have selected the External Instrument. From the attached photo you will see that I have then selected my Nord as the Midi destination. Midi Channel: All and Input 1-2.
Physically I have the Nord connected to my computer via USB and then a left and right channel running into my Focusrite Interface which is also connected to my computer via USB.
It all works fine but when I turn the Nord off, unplug it or bounce the project the nord no longer plays back. Surely there is a really simple step I am missing otherwise what would be the point of the external instrument function if it can't be retained?
[url=http://www.macprovideo.com/forum/upload/upload/server/php/savedfiles/files/301536_Screen_Shot_2015-01-20_at_10.08.23_am.png] [img]http://www.macprovideo.com/forum/upload/upload/server/php/savedfiles/thumbnails/mpv_44874_301536_Screen_Shot_2015-01-20_at_10.08.23_am.png[/img] [/url]