"For iArp to play a Part: Part Switch = On and either:
- Arp Part Switch (Off / On / Key Switch) = On, or
- Arp Part Switch = Key Switch and Part Key Switch = On
When either condition is met, + will appear in the status display"
"Why switch iArp Part via Arp Part Switch vs Key Switch?
- Switching via Arp Part Switch alternates the Part between iArp and Keyboard control
- Switching via Key Switch alternates the Part between iArp and Off"