Hi @Francisco_Concepcion, I confirmed with our hardware team and there are no Neural Mix controls in the (built-in) MIDI mapping. However, custom MIDI mapping with djay is pretty straight forward (refer to the topic I linked above).
I recommend that you try mapping one of the pad modes that you aren’t using, like Sampler, to Neural Mix Solo and Neural Mix Mute for all 4 STEMS.
If you use Neural Mix EQs, you could also map SHIFT + Headphone Cue to toggle between regular EQs and Neural Mix EQs.