If you are getting the "hardware disconnected" message in Scratch Live with your Rane hardware, it may be necessary to reinstall your Kernel Extension file.
The Kernel Extension files (often thought of as "drivers" for mac OS) are typically used to add support for new hardware and/or filesystems.)
To reinstall your Kernel Extension file, follow these steps:
1. Quit all programs
2. Go to Macintosh HD > System > Library > Extensions
3. Move the 'SeratoScratchDriver.kext' to your trash.
4. Download and reinstall the latest version of Scratch Live.
Open Scratch Live with your Rane hardware connected and now check if Scratch Live detects the hardware.