PreSonus FIREstation - Manual (Page 21)

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4.9 mLAN Return
The last knob of the FIREstation line mixer is dedicated to channels
assigned to the unit by the computer. These channels are the channels
routed to outputs one-four (TRS line out) on the FIREstation. These
knobs differ from the others in that there is no pan assignment. The
outer ring controls the line mixer volume of returning channels one
and two and the inner ring controls the returning channels volume of
three and four. The computer dictates panning on this dual concentric
knob. If channels are not routed to the FIREstation by the computer,
they will not be able to be monitored by the line mixer from either
output.
NOTE: The speed of the computer will determine the amount of signal
delay (latency) to these inputs. If a significant amount of delay is
noticed, the computer or software manufacturer may need to be
consulted to improve performance.
When the S/PDIF input is selected, it is automatically routed to
channels seven and eight. It is not possible to route this pair of inputs
to any other input channels. This is similar to when the ADAT input is
engaged. When the ADAT input is selected, it occupies channels one
through eight. The analog and S/PDIF inputs are not useable at this
point. This feature is especially useful when using the DigiMAX or
DigiMAX LT (microphone preamplifiers manufactured by Presonus) on
the ADAT input. This feature eliminates the need for external mixing
equipment.
The last channels on the line mixer are reserved for two to four
channels returning from the computer. These channels allow you to