Adresses are sometimes determined by the device/software your targeting. For instance, the reference manual for OSC in Mobius makes those adresses pretty clear:
http://www.circularlabs.com/doc/v2/osc.htm (great job Jeff).
If you use touchOSC, you specify those adresses when you create them in the template editor.
Not sure how you do it in Max, but you probably name them somehow. Bidule has an amazing OSC implementation... each level of a group corresponds to a level in the adress. For instance, if you have a gate named MIDI in a group name HUD), clicking on the gate will send out /HUD/MIDI 1 to whatever OSC client is assigned to that group. Very elegant.
One more thing to note, many software or devices (Osculator, missinglink, mobius) expect to receive a float value between 0.0 and 1.0 and will scale the parameters from that value.
What are you looking to do with OSC? (and have you left audiomulch behind?)
