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Sorry Felix - one further thought/suggestion following on from the above.
It occurs that this would all be much more intuitive if you were to add the ability to add the Harmony Plex remote as a virtual hardware remote in RB.
This would effectively 'hide' all of the complexity in knowing which Harmony key maps to which remote id/key being sent. The user could simply, for example, map the Harmony 'play' key to the correct function for each behaviour. This would also make it a lot easier to take advantage of the fact that Logitech/Harmony have added this new 'device' and to map it to all of the behaviours available in RB.
Another similar alternative would be to get Logitech to 'clone' the Plex device and create a 'Remote Buddy' device which is then generic.
Any thoughts?
Thanks again for all the help with this.
Regards,
Tom