If you just want to watch the sends, you can get all of them with abletonDeviceParameters set to # Mixer #. If you need to control them, you’ll have to use individual abletonParameters. My next update will include a Max device that controls multiple parameters, so be on the lookout for that in the next few days.
The abletonValueListener is made to access obscure parts of the Live Object Model that don’t have specific components associated with them. To use it effectively, you have to learn how to write the expressions that access the value you want. You will see the expression created by your LOM parameters in the Default Expression parameter, then you can append code to that with the Append To LOM Expression and property Parameters.