Hi,
I finally found what was my problem. 
In case someone has the same … here is it !
The problem comes from my homemade midi pedal (using PEDALINO github soft >>> amazing by the way)
When I was looking at the raw electrical signal coming from the pedal it was not as expected. Something else was sent !!! 
So I start to look at pin assignment in “pedalino.h” file !!!
In PEDALINO, the configuration for a ESP-32 (LILYGO_T_DISPLAY_S3) was set up on GPIO3 for MIDI output but ALSO for Fastled (don’t ask me why this is like this by default on V3.2.2 
)
So, I replaced the FAST LED GPIO from 3 to 18 (GPIO 18 = pedal number 6 that I will not use)
My MIDI raw signal became as expected and MODEP is now working fine !!! 
Thanks for your help, it allows me to look quickly inside modep and to switch somewhere else ! (otherwise i would be stuck to modep until now)
