Roland EDIROL AUDIOCapture UA-1A Manual Del Usuario página 22

Connections and driver installation (Macintosh)
fig.03-08.e
10
Select [Input] from the
Sound dialog. Then, in
Choose a source for
sound input:, choose USB
Audio.
11
When you have finished making settings, select [Quit]
from the [File] menu to close the Sound dialog.
22
Do not check [Play sound through output
device].
If you don't see USB
Audio, you should close
the Sound dialog. Then,
disconnect the UA-1A, and
wait about ten seconds.
Then, try doing the
procedure over again,
starting at number 2.