Selecting the USBPre in Mac OS
The USBPre communicates with the Mac OS operating system and audio software through
Apple's USB audio support in the Sound Manager. Audio applications that communicate with
Mac OS through the Sound Manager can use the USBPre for recording and playback. The USBPre functions as an
outboard audio interface and does not require any built-in audio hardware to
function.

To select the USBPre in the Sound Control Panel and test its connection:
- Connect the USBPre to the computer.
- Open the Sound Control Panel
from the Apple Menu.
- Select Input settings.
- Select USB Audio (this is the
USBPre). It will default to External Mic as the Input Source.
- Connect an audio source to an input of USBPre and select its input type via the front panel input selection
buttons on the USBPre.
- Verify that the front panel level meters are responding to the audio.
- Select Alert Sounds, and record
a sample alert sound to verify that the USBPre is recording to the computer.
- Play back the audio to verify that it has recorded.
Note: Do not plug or unplug the USBPre when actively recording or playing through the USBPre. The application and the operating system may become unstable. Unplug the USBPre only after exiting out of audio software.
Sound Manager setup for Mac OS
- Launch Extensions Manager: Select Apple Menu > Control Panels > Extensions Manager.
- Verify that the USBPre Composite Class and USBPre Config Composite
Class drivers are enabled. Verify that the PGUSBPre driver is disabled.


- Launch Sound Manager: Select Apple Menu > Control Panels >
Sound.
- Select USB Audio as Input: From the Input tab select the USB Audio
device. Note: This may appear as an external Mic or as a
Sound In device depending on your configuration.

- Select USB Audio as Output: From the Output tab select the USB Audio
device. Note: Depending on your configuration you may not
have a USB Audio option. Select Built-in for that case.

- Set the Main Output volume to the desired Level: In the Output
window set the main volume.

- Quit the Sound window when finished.
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