Midi goes from 0 to 127, so 128 values, *16 channels, so 2048 different signal values.
Every note or control change or else has a channel value e.g., 2/43 (value 43 of channel 2)
Regarding osc global module, here's what I know and have experienced :
in the left pat of the window 'keyword listener', when you get it active, it will show your local IP (M8 machine) and the used port for listening (receiving) OSC messages, usually 8002.
in the right part of the window 'keyword sender', you must enter Lemur local IP and a network port, usually 8000. This port is the port used by M8 to send OSC feedback.
in the lower part there's a checking box (print log in script output '. Then in the menu Modules/Script/Show script output, it monitor what ocs is going in and out and it helps a lot.
You have to set your Lemur the right way, sending osc on 8002 and listening on 8000.
It's a bit confusing in the beginning but quite simple to use.
Some OSC software seems not to use the same grammar, I have to investigate.
I hope It will help you to go next step !