Edirol UA-20 Owner's Manual page 44

Driver installation and settings (Macintosh)
1
From the Driver E (Mac OS 9) - ASIO folder of the CD-
ROM, copy [UA-20 ASIO1.0 16bit] to the ASIO Drivers
folder of the ASIO-compatible software you are using (e.g.,
Cubase VST, Logic Audio, Digital Performer, Metro, or
SPARK LE).
2
Start up your ASIO-compatible software.
3
Open the Audio setting dialog box of your ASIO-compatible
software, and select [UA-20 ASIO1.0 16bit] as the ASIO
Device.
44
The Audio setting dialog box
will be named differently
depending on your software.
For details refer to the manual
of your software.