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under “Volume” in this control panel is only
used to enable or mute the US-224 output.
Under “Sound In” you can select the “US-
224” instead of the Mac’s Built-in sources.
You can also do this under the “US-224”
control panel’s “System” tab. There you will
find a field labeled “Sound Manager Input”.
You can change this setting at any time,
even while a program is using the Sound
Manager I/O.