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ASIO Drivers for Mac OS
Enabling ASIO
Follow these instructions to enable ASIO functionality for the USBPre after
the software installation is complete. This will allow the USBPre to work with
applications that support ASIO devices.
- Launch Extensions Manager.
- Enable the USBPreASIO extension.
- Quit
Extensions Manager. Note: A restart of the computer is not necessary.
- Unplug, then reconnect the USBPre.
- Launch the USBPre control panel and verify that the
text "ASIO driver installed" is present.
- Copy the USBPre ASIO file,
which can be found in the Sound Devices USBPre folder, to the desired audio
application's ASIO Drivers folder.
- Launch the desired audio application.
- Configure the audio setup and choose USBPre ASIO as the driver.
Disabling ASIO Drivers
Follow these instructions to disable ASIO functionality with the USBPre and
to enable Sound Manager functionality.
- Launch Extensions Manager.
- Disable the USBPreASIO extension.
- Quit
Extensions manager. Note: A restart of the computer it not necessary.
- Unplug
and replug the USBPre.
- Launch the USBPre control panel to verify that the
text "Sound Manager driver installed" is present.
USBPre ASIO Control Panel
The USBPre ASIO Control Panel allows control of the USBPre input sample rate,
input recording resolution, and output resolution. This panel can be launched
from within an audio application's audio setup window.
- Device - Shows the device that is under control.
- Channels - Shows which
input channels the settings apply.
- Input Sample Rate - This is the rate at
which the USBPre will sample the incoming audio signal. The USBPre can support
32 kHz, 44.1 kHz, or 48 kHz.
- Output Resolution - This is the resolution of the
output bit stream. The USBPre can support either 16 bit or 20 bit output. Note:
If the recording resolution and the output resolution do not match a warning
message will appear in the Devices window. See the use dithering note for the
reason why.
- Recording Resolution - This is the size of each sample taken from
the input stream. The USBPre can support 16 bit, or 24 bit. Note: There is an
option for 32 bit recording but that does not result in true 32 bit resolution.
- Use Dithering - The use of dithering will improve the conversion to a lower
bit depth on both the output and the input. Enable the "use dithering"
check box in two situations. 1) The ASIO recording resolution is set higher than
the application recording resolution. 2) The application output resolution is
higher than the ASIO output resolution.
- System Performance - This controls
the speed at which the recorded signal is set. The ASIO control panel supports
Highspeed, Fast, Normal, and Relaxed. If you system has noticeable clicks try to
decrease the system performance.
ASIO Setup for the Mac OS
- Launch the Extensions Manager: Select Apple Menu > Control Panels
> Extensions Manager.
- Enable the PGUSBPre extension. Click on the square beside the
PGUSBPre extension so that an x appears.

- Verify that the USBPre ASIO file is placed into the ASIO Drivers folder
within your application. Example: Place USBPre ASIO into Cubase/ASIO Drivers.

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