Here is a method that allows you to send commands from the TriCaster with AE2 (maybe AE1?) to a 3PLAY Mini/440/4800 system. This will work if the systems are connected via NDI or SDI. You will need to manually type these commands into the macro editor on your TriCaster (or IP Series!) system.
There is a bit of editing you need to do to make these work. In the first image, I underlined in red parts that need to be changed. The IP address (192.168.1.87) has to be changed to the correct IP address of your 3PLAY system (do this IP change on all command lines, not just the one that is underlined). The '50' value is the playback speed, change this to your desired playback speed.
Here are the commands to play the currently cued clip at 50% speed.
The first command starts playback. If you only do this command you will get 100% speed playback on 3PLAY.
The second command set the playback speed to 50% (or change to any speed you want, you can go faster than 100%)
Here is the command to stop playback of the 3PLAY.
This command will stop playback. Run the command once and it works like a pause, run the command twice and it will reset the clip back to the start. You could put this command in the macro twice with a small delay between them if you just want a single macro that performs a clip reset.
If is possible to send other commands using this method as well, in fact, anything that can be done via macro in 3PLAY can be controlled from the TriCaster using 'http_request'
Just to make is a bit easier, here is a cut and paste for one of those commands shown above.