59. Crossfader: Use this crossfader to mix between the two active decks.10. Channel FX: Use these buttons to apply Effect A and/or B to the corresponding channel.11. Sampler Volume: Turn this knob to adjust the volume level of the software’s sampler.12. Master Level Meters: These LEDs display the audio signal level of the master mix (sentout of the master outputs).13. Master Level: Turn this knob to adjust the volume level of the master outputs.14. Booth Level: Turn this knob to adjust the volume level of the Booth Outputs.15. Booth EQ: Turn these knobs to boost or cut the high and low frequencies for the BoothOutputs.16. Mic Level: Turn these knobs to adjust the volume levels of the corresponding microphoneinputs. The Peak light next to each knob indicates the current signal level by its color:green (low), amber (normal/optimal), or red (maximum/peak).Important: The audio signals from the microphones are routed directly to the MasterOutputs.17. Mic EQ: Turn these knobs to boost or cut the high and low frequencies for thecorresponding microphones.18. Echo On/Off: Press this button to activate/deactivate the reverb effect on themicrophones’ audio signal.19. Mic Echo Level: Turn this knob to adjust the amount of the reverb effect on themicrophones’ audio signal.20. Mic On/Off: Press this button to activate/deactivate the microphones.21. Talkover/Post: Press this button to use the “talkover” feature, which automaticallyreduces the volume level of the master mix when you speak into the microphone.Press and hold Shift and then press this button to activate/deactivate the “post” feature.When on, the microphones’ signal will not be sent to the Booth Outputs.22. Phones Level: Adjusts the volume of the headphones.23. Phones Mix: Adjusts the software’s audio output to the headphones, mixing between thecue output and the master mix output.24. Split Cue: When this switch is in the On position, the headphone audio will be “split” suchthat all channels sent to cue channel are summed to mono and sent to the left headphonechannel and the master mix is summed to mono and sent to the right channel. When theswitch is in the Off position, the cue channel and master mix will be “blended” together.25. X-F Link: Press this button to link or unlink the Serato Video crossfader to the audiocrossfader.26. Deck: Selects which deck in the software is controlled by that hardware deck. The leftdeck can control Deck 1 or 3; the right deck can control Deck 2 or 4.27. Shift: Press and hold this button to access secondary functions of other controls.28. Sync / Sync Off: When using Serato DJ, press this button to automatically match thecorresponding deck’s tempo with the tempo and phase of the opposite deck.When using Engine, press this button to automatically match the corresponding deck’stempo with the tempo of the opposite deck. The Sync button on the master deck will flash.Press and hold Shift and press this button to deactivate Sync.Important: Sync is not possible between Serato DJ and Engine.