PreSonus FIREstation - Manual (Page 24)

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NOTE: if the mixer button is not engaged, the computer sets the
volume of mLAN returns one and two. In other words, the mLAN
return knob (potentiometer) is inactive (non-functional).
4.13 S/PDIF
The S/PDIF button switches channels seven and eight so that they
accept the S/PDIF input rather than the 1/4” TRS in or ADAT In. This
button assigns the S/PDIF inputs to channels seven and eight of the
line mixer.
4.14 ADAT
The ADAT button assigns the ADAT input signal to the line mixer and
to the TRS outputs as well. This button essentially defeats the TRS
inputs to the mixer and mirrors the ADAT input on the TRS outputs.
The ADAT button has other uses as well. Please refer to the Basic
Setup And Applications section of this manual for further details.
4.15 ADAT To mLAN
The ADAT to mLAN button routes the ADAT input to the mLAN output
going to the computer.
4.16 S/PDIF To mLAN
The S/PDIF to mLAN button activates the S/PDIF input. This button
routes the S/PDIF input to the computer, replacing channels seven and
eight. The S/PDIF button has other uses as well. Please refer to the
APPLICATIONS section of this manual for further details.