Revolabs FLX2 Advanced - Manual (Page 31)

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Mixing the audio signals
As discussed earlier, Audio and Video, or Bluetooth and
Video calls can be made simultaneously from a FLX
system, requiring FLX to mix the audio of the different
inputs to go to the different outputs.
In the Audio Controls menu, available from the main menu
and the Active Call Menu, the Audio Mixer menu is offered.
This menu offers three different audio mixer settings, based
on the output medium. The Speaker Mixer shown allows
defining the mix between AUX IN and the Phone input to be
played back on the Speaker. It is a sliding scale from -8 to
+ 8.
Similar Mixers are offered for Phone Out (mixing the signal
between AUX IN and the microphones), and AUX OUT
(mixing the phone input and the microphones).
The mix of audio can be changed during call time to ensure
that the various outputs best reflect the audio requirements.
The mixer menus do not replace the AUX IN and AUX OUT
volume settings described on page 40.