M-AUDIO Delta 410 - Manual (Page 33)

NOTE: When S/PDIF In is the master clock source, the digital
monitor mixer will run at the sample rate received at the S/PDIF In.
Since frequency response and sample rate are directly related, the
mixer frequency response will be directly related to the sample rate
of the S/PDIF input data.
MULTITRACK DRIVER DEVICES: The Delta 410 drivers intelligently
synchronize the beginning of recording and playback across all audio devices on
the board. When using application software that is capable of using multiple
channels simultaneously, select "Single and In-Sync" to ensure that all audio
channels will begin playback and/or recording at the same time. Otherwise select
"Independent" to allow the audio channels to play independently – this setting
may be desirable if more than one application needs to access the Delta 410
simultaneously.
DMA BUFFER SIZES: This section specifies the amount of system memory
dedicated to digital audio buffering. Setting a buffer size that is too small may
result in clicks or pops in the audio stream as some data may be lost. Larger
buffers cause slightly more latency but prevent the pops and clicks that might
occur with smaller buffer sizes – the default settings are recommended but you
may desire to tweak these default settings to suit your tastes. This buffer size
must be set in the Delta Control Panel before you launch your music software.
When using ASIO with the Delta 410, set the buffer size in the control panel,
then exit the control panel. After doing so, launch your music software.
SOUND MANAGER: The Hardware Settings Page in the Delta Control Panel
also contains software switches that allow you to select which Delta input and
output stereo pair will be used by the Sound Manager, if and when you choose
the Delta as the Sound Manager input and output device. If you go to the Apple
menu | Control Panel |Sound and highlight the Delta icon for Sound In and Sound
Out, then your Apple system sounds will be routed to the Delta hardware output
that you have selected here, and Alert Sounds, if you choose to record, will
receive their input from the Delta hardware input that you select here.
You will want to choose the Delta for input and output in the Sound control panel
if your music program does not use ASIO and the Delta ASIO drivers. If you are
using the ASIO drivers (see Mac Software Installation), you may want to leave the
Sound control panel selection to “built-in.” With the Sound control panel set to
built-in, these Sound Manager settings in the Delta Control Panel will have no
effect, and your system sounds will come from your internal sound card.
The Sound Manager driver limits you to using only one of the Delta 410 stereo
input pairs for audio input and only one of the stereo output pairs for output.
These do not need to be matched pairs- you can use inputs 1&2 for Sound In and
S/PDIF for Sound Out, for example, or any combination that you choose. The
following screen shot shows the Hardware Settings page on the Mac with the
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