Mapping Traktor VU meter levels on DN-X1600

Has anyone managed to map the VU meter levels when using Traktor in internal mode?

I’m not an expert in mapping, but I’ve looked at the DN-X1600 documentation in the ‘receive commands’ section which says that the command is “0xBn” and the midi command numbers are “ON TRG : 0x50” and “OFF TRG : 0x51”, which is CC 080 and CC 081 (and as I’ve seen on other devices).

There are then 16 values, corresponding to the 16 LEDs per channel. I can make all the LEDs light up, but that’s regardless of the level or even if anything is playing at all. But I just can’t work out what the correct settings are in Traktor for them to light up (or not) properly.