iTunes disable command by trackpad

Since a few months, iTunes is listening to the track-pad fingers command previous and next (3 fingers swipe) even if it's not the active application (ie: has focus).

This is extremely annoying when browsing the web and listening to music. How can I disable this shortcut that I didn't set up ?

I've searched in the trackpad settings, the itTunes ones and the keyboard => shortcuts but didn't find the solution.