I've compiled information for dynamically updating the RDS information sent out by a Vast transmitter which uses "VAST HiFi-FMT Control System" software. You can use the Vixen Launcher plugin to update a text file which is periodically monitored by the VAST HiFi-FMT Control System. This will enable you to change the RDS message, with a small delay, as often as you like in a Vixen sequence. I know that the launcher plugin is available on Vixen 2.x but I am not familiar with the later versions. Your comments and corrections on the attached PDF would be appreciated.
