In case you get bored, but ymmv.
1) Start Mac in Recovery Mode (hold Cmd+R at startup).
2) Utilities -> Terminal
3) Run the following command to disable the Integrity Protection system:
csrutile disable
4) Get Drivers (UA-25 Driver Version 1.0.1 for Mac OS X Mavericks (10.9)
https://www.roland.c...8-8f6d-41312d891337/
File name: ua25-mx9d-v101.tgz
MD5: 0aae5df7da424f07d97f97c8f8e2a4db
5) Open Terminal and enter the following commands to patch the driver:
cd à HOME/Downloads
tar xvf ua25–mx9d–v101.tgz
cd ua25'mx9d'v101
pkgutil --expand UA25 USBDriver109.pkg DriverFiles
cd DriverFiles
sed -i "" "s/'11.0'/'13.0'/" . /Distribution
pkgutil --flatten . HOME/Downloads/RolandMonterey.pkg
6) The download folder is now a file called RolandMonterey.pkg. Install these via double click. Restart.
7) Enter the following command in the terminal to load the kernel extension of Roland:
sudo kmutil load -p /Library/Extensions/RDUSB0074Dev.kext
8) The following error message should come:
Error Domain-KMErrorDomain Code 27 "Extension with identifiers jp.co.roland.RDUSB0074Dev not approved to load. Please approve using System Preferences." UserInfo-NSLocalizedDescription with identifiers jp.co.roland.RDUSB0074Dev not approved to load. Please approve using System Preferences.
That is normal.
9) System Preferences -> Security & Privacy -> General -> Lock -> Allow allow kernel extension from Roland