Roland / Edirol PC-300 has been obsolete for many many years but I realized the computer would give usb power to it so I decided to fix this once and for all. Works flawlessly, tested on macOS 12.7.6 / Monterey. Should work in the later OSes as well but I am very greatful for your feedback on that.
The driver is a very small app, you just start the app to activate the driver and it works as long the app is active. The app can be in your startup objects and it’s automatic. Might need a force quit from the dock if you need to reboot.
Pay what you want! I am emailing the app zipped and this is a manual process so please allow for a few hours of delivery delay.