I’ve been doing a bunch of edits today and they work from my iPad so perhaps I can offer a suggestion.
Firstly [midi: PC12.2@2] just about covers it, extra commands need a comma
Like this
[midi: PC39.2@2, PC14.1@3]. For two devices or ….,.
[midi: PC39.1@1,CC115.0@1,CC117.0@1] for a long command on one device
The word Midi should be lower case and needs a space before the program change message
Make sure your midi gear is set to receive on the correct channel