Handy Guitar Lab for B2 FOUR is a remote-control app specifically designed for the B2 FOUR EFFECTS & AMP EMULATOR.
With the app, you can download new effects, and manage which effects are installed on the device.
You can also view and download new patches, customize the patch list on the device and create backups for safekeeping.
The app gives you the ability to edit existing patch memories as well as create new patches from scratch.
The app will let you know when firmware updates are available and install them for you if you choose.
The app supports iOS/iPadOS VoiceOver to provide accessibility for the visually impaired.

* Handy Guitar Lab for B2 FOUR connects to your device with a USB (Type-C) cable. Use a Lightning to USB Camera Adapter to connect to an iOS/iPadOS device with a lighting connector.