Map Xone K2 for new function STEMS separation

Hi

Create STEMS WORK but i don't be able to map the MUTE for slot 3 and 4 for track A and B.

I find the relative command but doesn't work as a TOGGLE as i SET, but WORK as a GATE mode.

I can try to use VOLUME controller but in DIRECT set doesn't work , work in INC and DEC mode with SWITCH set, but if i set INC TRAKTOR work only in increse.

I try to map the same button with MODIFIER 1 set to 1 for set the DECRESE of VOLUME but doesn't work.

I want set in one button of my Xone K2 the MUTE of the VOICE (slot 4...), and the OTHER (slot 3) for track A and B with four buttton. On my second F1 (MIDI MODE) i want set SOLO/NO SOLO for VOICE (Mute SLOT 1,2,3…) in track D with one button.

It is possible?

Can you help me?