On this page you can find a "MSB LSB Program Change Calculator", also for the Nord Stage und Nord Stage 2:

https://www.keyboardwaves.com/calculators/

There you can calculate which MIDI commands must be sent to the keyboard to remote select a specific Voice Preset.


Configure then the three "Midi wheels" in the edit screen of the song in SongBook+ and enable the switch "Send MIDI command on open".