Apple Logic Pro 8 - Manual (Page 870)

870 Chapter 39 Working in the Environment
To make a direct output connection:
m Click the Port menu in the object’s Parameter box, and choose the desired MIDI output.
The Port menu lists all MIDI Outputs, plus the following options.
 The Off setting completely disables the connection to the MIDI interface port.
 The All option routes the object’s output to all available MIDI ports. This may be
useful if the device is sending a pulse, for example.
Note: If you have a MIDI interface with more than one output port (or even several
interfaces which can be stacked), you can set up a direct connection to one of the
individual ports (1 to 63) of that (or those) interfaces.
Any object with a directly assigned output is indicated by a white triangle on its right-
hand side. The triangle is hollow when there is no direct assignment.
Object with direct output
assignment
Object without direct
output assignment