I've been having a fight with Max4Live recently about using midi devices. I'd like to make a gigantic patch which integrates all my control surfaces, and replaces lots of the automap functionality with something that fits my playing style better. The problem is:

• m4l replaces max's midi functionality with its own driver, which takes midi from the Live channel the device is on.
• so you can't use multiple devices in a patch. At least, you can't differentiate them.
• a workaround would be to put each device on a different midi channel, and then separate the midi data inside the patch.