OK, I found what was wrong. I was doing this instead of that...
In a nutshell, we are doing an interactive audio-visual installation (using a dome, 360 degree projectors and a quadrophonic audio system) where Wiimotes embedded in objects will allow the public to control various sound/image parameters.
Now, I m using Ableton live & Max for Live (M4L) to generate/modulate sound, and OSCulator as a "message hub".
So, Wiimotes ---> Osculator --OSC--> M4L (Wiimote data converted to control various effect parameters in ableton) ---OSC---> Osculator ---MIDI---> Ableton
Yes, ableton cannot handle OSC and M4L cannot directly send midi to Ableton (or so I understand...).
As I would like to monitor the system without having to stand next to laptops, I thought of duplicating the midi messages and forwarding them as OSC (after re-scaling them ;) )to the ipod.