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USBPre Control Panel - Mac OS
The USBPre Control Panel duplicates the selections of the front panel of the USBPre hardware. In addition, the
USBPre Control Panel enables resetting the USBPre hardware to accommodate
multiple sample rates, and accesses the help file. The Control Panel also
indicates whether the USBPre is configured as a Sound Manager device or as an
ASIO device. The set sample rate is
indicated below the USBPre Device list.

To launch the USBPre Control
Panel, select USBPre from the Control Panels list from the Apple Menu. If a
USBPre is not connected, the control panel is greyed out, indicating that no
USBPre hardware is connected to the computer (below).

Configuration Files
The USBPre is shipped from the
factory with a record sample rate of 44.1 kHz. To change record sample rates,
hold down any front panel button while plugging in the hardware. This will
bring up the following menu:

The dialog box shows. Follow the
instructions and click Configure:

After selecting Configure, a
list of six possible configuration settings will be available. Select from the
following:
Configuration Types
There are three variables to the USBPre's Macintosh configuration files.
The syntax of the file names is as follows:
Input Type_Output Type_Record Sample Rate.adx
Input Types - There are two different input types, Mic In and
Sound In. Both types function identically in most applications. The
difference is the selection in the Sound Control Panel, where the USB audio
device (USBPre) will show up as either a Mic source or a Sound In source.
The one advantage of a Sound In configuration type is that the selection
"Play Through Hardware" is available in the Sound Manager Control
Panel. Playing through hardware is not available with Mic In types.
Output Types - Two different output types, Speaker and Line are
available. With the Line configuration type the USBPre shows up in the audio
output selection of the Sound Control Panel as a separate USB audio output
device. Because it is seen as separate hardware, it can be selected as
required. With the Speaker output types, the USBPre is not seen in the Sound
Control Panel as a selection - it becomes the "built-in" audio
device, and simply takes over all playback audio functions of the Macintosh.
To revert to internal speakers, unplug the USBPre with the Speaker type.
Record Sample Rate Selection - Three possible record sample rates
are available, 32 kHz, 44.1 kHz, and 48 kHz. When using the S/PDIF input on
the USBPre it is very important to select a Record Sample Rate that matches
the source material, otherwise objectionable audio will occur.
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