Midi problem with a Prophet REV 2 and Ableton with two layers

[Twisty]

Hello, i have a midi problem with a Prophet REV 2 and Ableton with two layers. I give you the symptom: On Ableton, I connected a Prophet REV 2 in midi din IN and OUT via a motu micro lite, I opted for 2 layers each on a track of Live. The first in channel 1 and the second in channel 2. (When using 2 differents midi channels on the DSI, the second midi channel used is by default the first channel +1). I put All in midi channels on the DSI. My komplete keyboard controls layer 1 when I arm the track but does not control layer 2 in the same way. It seems completely crazy to me. I've done a lot of research but nothing works. I do not want to switch the Komplete to Midi DIN, it is connected via USB at the risk of losing the NKS interface. Do you have an idea? It’s driving me crazy, thank you