You can use the http_request command and the TriCaster REST API to trigger macros in 3PLAY. Create your macro on the 3PLAY, then use the following command. (I'm going from memory on this, so if it doesn't work let me know and next time I'm in front of a system I'll double check the command.)
Shortcut: http_request
Value: http://{3play-ip}:5952/v1/shortcut?name=play_macro_byname&value={macro name}
Replace {3play-ip} with the TCP-IP number of the 3PLAY system
Replace {macro name} with the name of the macro you want to run
Here is an example of how this command would look like in the macro editor. Note that this example is controlling VLC Player, but the formatting will be similar.
