Reply to Mapping problem [NOT DJ Techtool Product]

Hi everyone.

I tried many times to map my Akai LPD8 knobs to the macro controls in Massive NI. I know how midi learn works in Massive. When I assaign the modulation wheel from my M-Audio Keyrig 49 the midi signal pass correctly.
I don't understand why its keep not working on my LPD8....
I tried to unpower my Midi keyboard. I also tried to use the same midi channel for my LPD8 (channel from Keyrig49). nottin' happens.
I know the LPD8 is not a Techtool product but help would be very appreciated.