TL Audio M4 - Manual (Page 11)

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Pan Control
The pan control positions the image within the stereo field, from fully left in the
anticlockwise position, through centre at the dented position to fully right in the
clockwise position. The gain law is -3dB at the centre.
Mute Switch
The channel may be muted or switched on without affecting the level set on the
channel fader. Red LED indicators show which channels are currently muted.
PFL Switch
When PFL (Pre Fade Listen) is activated a yellow LED illuminates above the button
on the channel strip and also in the master section. PFL allows you to monitor the
incoming source before it reaches the channel fader and the signal is sent to the
main output. It is normal to use PFL when setting the gain level for an incoming
source.
Channel Fader
A 100mm fader is located at the bottom of the channel, and sets the level of the
channel's signal being fed to the stereo mix bus. The fader provides up to 10dB
of gain at its highest point.
Drive and Peak LEDs
The yellow Drive LED provides a visual indication of the signal level through the
input valve stage, and therefore the extent of 'warming' or valve character being
introduced. The drive LED will gradually illuminate as the input level or gain is
increased, over the range +6dBu to +16dBu. The red Peak LED operates as a
conventional warning that clipping is about to occur. The operating level of both
input and post fader stages is monitored, and the LED illuminates at a threshold of
+21dBu, when there is less than 5dB of headroom remaining to the direct output.
Normal operation would be to set the input gain so that the Drive LED is
illuminating regularly, with occasional illumination of the Peak LED occurring on
loud transients.
Stereo Mix