On the Elements section, click the Add button to add the required elements to the project:
External Control > OSC > Generic OSC
External Control > MIDI > MIDI Output
Click the toggle buttons on the the elements to enable them.
Double-click the Generic OSC element and add your OSC controls to the Inputs list:
Name: name identifier of your control
Address: the OSC address
ValueIndex: in case the message carries more than one value, select which one to take (zero-based)
Range: min and max values for internal normalization
Type: button, fader or encoder
Note: Name and ValueIndex must be unique (no duplicates)
Open the Mapping section and select the desired MIDI Output functions. Start by selecting the MIDI Output element on the left list (functions). Select a desired output (Note On, Control Change, etc.) and tune the parameters.
Finally select the Generic OSC on the right list (controls) and assign the previously selected MIDI Out function to one of your controls.