PreSonus FIREstation - Manual (Page 23)

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be synched to the FIREstation by either using the BNC Word Clock
output, the ADAT output, or the FireWire output. The EXT mLAN mode
causes the unit to be synched to the computer. This mode is especially
useful when recording with multiple FIREstations. The other EXT
modes would sync the FIREstation to other digital devices either by the
BNC in, or the ADAT in.
NOTE: S/PDIF external sync is not necessary because the (S/PDIF)
input signal is resampled and realigned by the FIREstation.
4.11 Headphone/Main Out Control
The headphone/main out control respectively controls the two outputs
independently. The inner ring controls the HEADPHONE volume and
the outer knob controls the MAIN OUT volume. The audio content of
both volume controls is dependent on the routing and volume settings
of the line mixer. It is strongly recommended that the volume of both
of these outputs be lowered completely when engaging the tube drive,
connecting or disconnecting external equipment or when powering up
the unit.
NOTE: If a signal is not routed to the line mixer, it will not be present
in either headphone/main out signal output.
4.12 Mixer
The MIXER button engages the line mixer. If this button is not
engaged, only mLAN return channels one and two will be present in
the Headphone/Main out mix. All other functions of the mixer will be
disabled.