CC74 in MPE not working on my S6 keyboard

UDO Audio Gear Super 6
#1

Am using my Linnstrument set to Vertical controlling CC74 to try it out on filter cutoff
(I read in the manual that this CC74 should effectively be hard-wired to the filter cut off)
Setting my Linnstrument vertical axis to CC1 effectively controls the S6 LFO2 amplitude so my problem is apparently not coming from the Linnstrument set-up
All other MPE expected feature work (polyphonic pitch bends, polyphonic AT)

am I missing something here ?

#2

ah found my own solution alone : setting SHIFT TX/RX E to lit 2 (ie “receive CC”) solved the prb