Link to the video by @HazeAnderson with the same phaser switch issue:
   • Let's Talk About String Synths (with ...  

0:00 opening demo
0:53 some background of the Solina
2:40 phaser switch backwards
4:30 the ensemble effect
6:00 the polyphony issue / mono section
8:10 the trumpet and horn
10:00 more about the strings
12:30 with stereo delay and phaser
15:00 closing