kmll

I would like to create my own device for controlling Ableton parameters. This is similar to the LFO.amxd included in the "Max For Live Essentials" pack but I want to use my own methods for creating the values to map. When I open the LFO.amxd in Max this is unfortunately disabled for editing so I am not able to have a look at the code here. Does anyone know if it is described somewhere how this can be done?

Map value from Max to Ableton device