[Demo 1 - Arranger 1]
[Demo 1 - Arranger 2]
[Demo 2 - Arranger 1]
[Demo 2 - Arranger 2]
[Demo 2 - Arranger 1]
[Demo 2 - Arranger 2]
[Demo 2 - Arranger 1]
[Demo 2 - Arranger 2]
[Demo 2 - Arranger 1]
[Demo 2 - Arranger 2]
Arranger 1 -> 2, change after bar 8
Arranger 2 -> 1, change after bar 8