TL Audio M4 - Manual (Page 12)

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Two 100mm faders control the stereo mix output level.
Aux Masters
Each aux send features a rotary master level control, which governs the overall
level from the aux output. An associated PFL switch allows each aux send to be
auditioned in isolation, by placing the aux signal (pre the master level control) on
the PFL buss. An operating level switch is provided adjacent to the rear panel
connector which selects whether each aux send functions at -10dB or +4dB,
allowing easy interfacing with all types of equipment.
Effects Returns
The two stereo effects returns are each equipped with a rotary fader and a L/R
balance control. Both returns are fed directly into the stereo mix. A PFL switch
allows each return to be auditioned in isolation. A mono signal can be fed to
either of the returns by connecting it to the left hand return input only. This will
automatically feed the mono signal equally to both left and right hand sides of the
stereo buss simultaneously. An operating level switch is provided adjacent to the
rear panel connector which selects whether each aux return functions at -10dB or
+4dB, allowing easy interfacing with all types of equipment. The effects returns
are typically used to feed the outputs of FX devices back into the stereo mix,
adding 'wet' signal to the 'dry' stereo mix. However, the returns can also be used
as simple extra line inputs for signals that require no EQ or FX to be added to
them via the mixer.
Monitor and Headphone Level
The M4 provides a stereo monitor output, for connection to a power amplifier and
monitor loudspeakers, plus a front panel headphone output. The Monitor level
control governs the level of signal fed to both these outputs. The monitor signal
normally follows the main stereo output, but will automatically switch over to the
PFL buss whenever any PFL button is pressed, this condition being indicated by a
yellow LED. Similarly, the monitor signal will follow the 2T return when the 2T
return switch is activated in the master section.
PFL Balance Level
The PFL Balance control allows adjustment of the PFL signal level relative to the
main stereo monitor level, as the PFL signal could be considerably louder than the
stereo output - depending on the mix and sound source.