M-Audio ProFire Lightbridge User Manual - page 13
M-Audio ProFire Lightbridge User Guide
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ASIO/WDM Buffer Size (Windows Only)
In this field you can select the buffer size you wish to work with. Lowering the buffer size will result in lower latency
(“latency” refers to the time it takes for your input signal to pass through your audio software and appear at the
outputs). However, this may cause slower systems to become unstable or to generate clicks and pops in its audio
streams. The default buffer size setting is 256 samples, but you may want to experiment with lower settings in order
to minimize the latency of your system. If you experience stuttering or crackling in your audio playback, increase the
buffer size until these artifacts disappear.
Active Ports
These checkboxes allow you to enable and disable various digital ports. Disabling unused ports not only helps to
reduce the processing demands placed on your host computer but also provides a way to block out signals from
connected, but currently unsynchronized external digital devices. This, in turn, helps to avoid conflicts between
incompatible or unsynchronized digital clocks and provides for uncompromised word clock stability.
NOTE: Some DAW applications support only a limited number of physical inputs and outputs. If you are using a
program that limits the number of inputs and/or outputs to fewer than the interface’s 34 inputs or 36 outputs, you
may not be able to access the S/PDIF I/O or analog outputs, depending on the channel order configuration (see
page 14).
Sync Source
In this field you can select the source of your master word clock. (For more information on sync source, see
chapter 11.)
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internal – ProFire Lightbridge’s internal clock acts as the word clock master. This is the default
selection.
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word clock in – Word clock is derived from the BNC word clock input.
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coaxial in (spdif) – Word clock is derived from the coaxial S/PDIF input.
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adat 1 – 4 – Word clock is derived from one of the ADAT optical inputs.
NOTE: The sync source options for Word Clock, Coaxial, and ADAT 1-4 are only available if the input ports
are active (these options are grayed out if the ports have been disabled).
Analog Output
This field lets you select the source for ProFire Lightbridge interface’s analog outputs:
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mirrors spdif output – The analog outputs play back the same signal as routed through the S/PDIF
output. In this configuration, the analog outputs do not appear in your DAW software as independent
outputs.
If this box is left unchecked, the analog line outputs appear in your DAW as a separate, assignable
output.
The headphone output always follows the analog output source. This means that if the “mirrors spdif
output” box is checked, then both the analog outputs and the headphones mirror the S/PDIF output. If
this box is left unchecked, then the S/PDIF and analog outputs are independent of each other and the
headphone output only mirrors the analog outputs.
NOTE: This setting must be selected before launching your DAW application in order for the analog
line outputs to appear correctly in the DAW application.