breaking the apc40 knob defaults via max

I'm banging my head against a wall here. Any help would be greatly appreciated.

What message can you send to what path to a) turn off the default functionality of the apc40 knobs but b) still have their LEDs respond to messages?

I can send "call send_value X" to "path control_surfaces Y controls Z" to update their LEDs. No problem.

And I can send "call enable_0" to "path control_surfaces Y" to break their default mapping, but this turns their LEDs off until I "enable_1" again. I've found different levels further down to disable them (via components, etc.), but in each case, severing the connection prevents the LED messages from working. The other elements (i.e. the matrix) don't work this way - I can send LED messages to the matrix while it is disabled and the LEDs are updated appropriately.

I know there's a message X to live.object Y that will do it, but I can't find it. It's driving me crazy.