(6) MIXER FX Amount knob: The MIXER FX Amount knob controls the amount/ratio of the MIX-
ER FX  to be  applied to the  audio signal.  In center  position the MIXER  FX is  disabled. For  more
information, refer to Working with Mixer FX.
(7) MIXER FX ON button: Enables or disables the MIXER FX for the individual Mixer channel. For
more information, refer to Working with Mixer FX.
(8) CUE button: Routes the audio signal of the Mixer channel into the CUE channel. For more in-
formation, refer to Using Cue Channel.
(9) Channel fader: Adjusts the Mixer channel’s level before the audio signal is sent to the cross-
fader and MASTER volume knob. For more information, refer to Adjusting Levels.
(10)  Channel  Level  Meter:  The  Channel  Level  Meter  gives  you  visual  feedback  on  the  current
channel volume. The  blue  LEDs  indicate the signal is  below  Headroom  area, The red LED  indi-
cates the signal is clipping. The yellow LEDs indicate the signal is currently in the Headroom area
above 0 dB and below +6 dB before it starts to clip.
(11) MIC C or D / PHONO LED: On Mixer channel A and B, the PHONO LED lights up if the exter-
nal input for  the  Mixer  channel is set to  receive  a  phono level signal from  a  turntable.  On Mixer
channel C and D, the MIC LED lights up if the external input for the Mixer channel is set to receive
a microphone signal. For more information, refer to Integrating External Devices.
(12) EXT button:  Selects  the  source  of  the incoming signal.  For  more  information,  refer  to Inte-
grating External Devices.
• On Mixer channel A and B, either line, Live Input (external), or Phono. 
• On Mixer channel C and D, either line, Live Input (external), or microphone.
(13) LINE  LED:  Indicates if  the external input  for the Mixer  channel is set  to receive a  line level
signal, e.g., from a CD player. For more information, refer to Integrating External Devices.
5.3. FX Unit
The  FX  Units  1  and  2  on  your  S4  allow  you  to  control  the  effect parameters selected in  the  FX
Units in the TRAKTOR software. The FX Units can be assigned to any Mixer channel.
FX Unit 1 controls.
(1)  -  (4)  FX  knob  1  -  4:  Adjusts  the  individual  effect  parameter  selected  in  the  FX  Unit  in  the
TRAKTOR software.
(5) - (8) FX ON button 1 - 4: Enables or disables the individual effect parameter selected in the FX
Unit in the TRAKTOR software.
TRAKTOR KONTROL S4 Overview
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