FM Essential, from Yamaha, was updated with, "Support for MX88 BK activation." The app is crippled unless you connect a pricey Yamaha MX keyboard. Today's update means the priciest of the bunch, released yesterday for $1,300, will also unlock the app.
What's new in FM Essential [US] v1.1.2:- Minor Bug Fix
- Support for MX88 BK activation
The update arrives with a new demo of the unlocking process.