https://www.boss.info/us/products/gt-100/downloads/ листаем в самый низ.
[ Version 2.10 ]
Functionality Improvements
Periodic sending of MIDI pitch bend sensitivity was stopped.
Support for GT-100 Driver Ver.2.1 was added.
GT-001 Driver Ver.2.1 has been provided with a function for switching the sampling rate.
* Use the GT-100 Ver.2.10 in combination with GT-001 Driver Ver.2.1.
_______________________________________________________________________________________________________________
Changes in Operating Systems Compatible with the GT-100
The GT-100 Ver.2.10 is to be used as a set together with GT-100 Driver Ver.2.1.
When using the GT-100 Ver.2.10 connected to a computer, make the connection to a computer that is running a supported operating system.
The operating systems compatible with GT-100 Driver Ver.2.1 are as follows.
Windows 7 / 8 / 8.1 / 10
macOS 10.12
OS X 10.9 / OS X 10.10 / OS X 10.11
* If the computer you're using runs an operating system that is not supported, use GT-100 System Program Ver.2.03 and GT-100 Driver Ver.2.0.0.
_______________________________________________________________________________________________________________
Короче поправили баг с самопроизвольной периодической отправкой pitch bend sensitivity по миди. И добавили поддержку нового драйвера Driver Ver.2.1, который, как я понял, теперь работает с новыми яблочными операционками. Так как винда 10 была и в прошлом драйвере.
Новых ампов и эффектов я в описании прошивки не вижу

Похоже, что это чисто техническое обновление.