Jeff
I have never touched Crestron, but I believe that the
Sooloos API was developed to facilitate such integration. It's quite basic and parts are the same as the 'explore' functionality as offered on many of the Sooloos control screens. It's not going to do full Meridian system control though.
I'm currently playing with the API so can help with some questions re the API but not Crestron related.
Rick at Audio Images might be able to provide more info re AMX/Crestron integration as I believe that they worked with Meridian in this area.
Hth