SSL 2 and 2+ are class compliant and will work straight out of the box with macOS.
Simply plug it in, select SSL2 or SSL2+ as the sound device in System Preferences and you are ready to go.
SSL 2 and 2+ require an ASIO driver to be installed on Windows OS.
The driver can be found on the SSL website by registering the device in your SSL account, or from the general support downloads page. Right-click to save-as.
SSL 2 / 2+ is class-compliant, but not officially supported on iOS.
SSL 2 / 2+ is not tested on Android.