Boss GS-10 Owner's Manual page 125

5.
In "Choose a source for sound input (Device)," select "USB audio."
fig.11-670
* Do not check "Play sound through output device".
6.
When you are finished making settings, close the "Sound" dialog box.
7.
From the File menu, select "Quit."
Installing & Setting Up the Driver (Macintosh)
If USB audio is not displayed,
close the "Sound" dialog box,
and disconnect the GS-10's
USB cable from the Macintosh.
Perform the driver installation
(p. 123) once again.
125