I don't use channel 4 much so I've missed it while testing but the default mapper for DDJ SX does in fact miss the VU output on channel 4 just tested it.
you need to make a copy of the original mapper inside the MIDI manager
First find the DDJ SX in the list of controllers then press the x2 button
of to botton of list and a new DDJ SX mapper should be the export it to somewhere you can find it back easy.
Now open the mapper in an XML editor
scroll down to line 8287 you should see this
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<mapping>
<control alias="fam(Mixer).ChannelCMeter" value="%"/>
<MIDI type="CC" parameter="0x2" channel="0x3" value="%"/>
</mapping>
then past this code after it
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<mapping>
<control alias="fam(Mixer).ChannelDMeter" value="%"/>
<MIDI type="CC" parameter="0x2" channel="0x4" value="%"/>
</mapping>
This gives you LEDs for channel 4
And that needs to be added to the default mapper in Cross sylMV
edited the title to get feedback and testing /recognization 
