User guide

Appendix a: Configuring CoreAudio (Mac OS X Only) 21
Using the CoreAudio Manager
Use CoreAudio Manager to change the CoreAu-
dio Buffer Size setting, access the Hardware
Setup dialog for your Pro Tools hardware and
control volume and mute for the CoreAudio
Driver. CoreAudio Manager also identifies your
Pro Tools hardware, the supported number of
Input and Output Channels and the number of
attached clients (applications).
Buffer Size
You may select from the following buffer sizes
(depending on your Pro Tools hardware):
• 64 samples
• 128 samples
• 256 samples
• 512 samples
• 1024 samples
• 2048 samples
Changing the Buffer Size for the CoreAudio
Driver does not affect the H/W Buffer Size setting
in the Pro Tools Playback Engine dialog.
To configure CoreAudio Hardware Buffer Size:
1 Double-click the CoreAudio Manager file (lo-
cated in /Applications/Digidesign/).
2 From the Buffer Size pop-up menu, select the
desired CoreAudio buffer size (in samples). Gen-
erally, smaller buffer sizes are preferable. How-
ever, if you experience any problems with
performance (such as clicks and pops during re-
cording or playback), try increasing the CoreAu-
dio Buffer Size setting. You can also change the
buffer size from within the client application if
it is the only client attached to the CoreAudio
Driver. Once two or more clients are active, you
will not be able to change the sample rate or the
buffer size.
HW Setup Button
The HW Setup button opens the Hardware Setup
dialog for your Pro Tools hardware. The HW
Setup button is only available when no clients
are using the CoreAudio Driver.
To configure CoreAudio HW Setup:
1 Quit any CoreAudio client applications.
2 Double-click the Digi CoreAudio Manager file
(located in /Applications/Digidesign/).
3 Click the HW Setup button to open the Hard-
ware Setup dialog.
4 Configure the Hardware Setup dialog for your
Pro Tools hardware. If you have more than one
audio interface connected to a Pro Tools|HD sys-
tem, be sure to select and configure only the pri-
mary audio interface connected to the HD Core
card.
5 When you are finished, click OK to close the
Hardware Setup dialog.
For more information on the Hardware
Setup dialog, refer to the Pro Tools Refer-
ence Guide.