The Deep Harmony extension will handle the link between Roon and any hub based Harmony remote you buy. Direct IR control of Roon through Mac OS is possible but requires a lot of fiddling, extra software and lots of failure points. The Deep Harmony extension is a small program that sits and listens for IR commands that the Harmony hub receives and translates them to Roon commands, plus a lot of other functions. The learning curve is not shallow, but not insurmountable with a bit of patience.
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