M-Audio Delta Audiophile 2496 Manual page 23

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 Audiophile 2496 drivers may
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 Audiophile 2496
simultaneously. A third option appears when more than one Delta series card is
installed in the machine. The "Multiple Card Sync" selection may be made when you
want all channels across all installed Delta cards to begin playback and/or recording at
the same time.
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.
ON THE MAC: The Hardware Settings Page in the Macintosh version of 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 Audiophile hardware output that
you have selected here, and Alert Sounds, if you choose to record, will receive their
input from the Audiophile hardware input that you select here.
You will want to choose the Audiophile 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), then 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.
The Sound Manager driver limits you to using only one of the Audiophile 2496 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 Sound Manager I/O set to
"Analog 1&2" for Input and "Analog 1&2" for Output. Once you have made a
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