PreSonus FIREstation - Manual (Page 9)

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specific FIREstation. If a different FIREstation is added, it will need to
be rerouted.
2.3 Recording
When recording the headphone output can be used for headphone
monitoring and the main outs can be used for control room monitors.
This setup negates the need for an external mixer. The volume setting
of the Main/Headphone outs and the Line Mixer do not affect the
recording level.
2.4 Mixing
As far as the use of the FIREstation goes there are two different mix
modes: Internal and External. Each mode has its benefits that are
determined by your overall computer speed and capacity, familiarity
with recording software, and creativity.