Hi DarkKman,
You might also find some useful information in this thread: Wondering why MIDI is being cut off?
The main problem with holding notes across song changes is that the routes from your controller keyboard to racks/plugins are disconnected and re-connected when changing songs, so even if the song routing and racks etc are the same, there’ll be a discontinuity, where MIDI notes get released.
One workaround is to do your routing inside a linked rack that exists in both songs, so connected directly from your MIDI controller port inside the rack to your plugin, and from the plugin’s audio output directly to your audio interface port, again inside the rack. That way, those connections are maintained and not cut, the way song-level audio/MIDI routes are. However, it’s cumbersome and you lose a lot of the flexibility of songs. However, if you don’t do it too often, it might be worth setting up a rack especially for this purpose, e.g. a pad rack that has that kind of routing, allowing you to hold a pad chord over a song change.
Maintaining held/sustained notes across song states works beautifully, however, so my recommendation would be that for pairs of songs you typically “join”, set them up as a single song in Cantabile, and just change via a song state. Not ideal, but it’ll work, as you’ve found.
Neil