Apple Logic Express 7 - Manual (Page 177)

Chapter 5 The Environment 177
Physical Input/Sequencer Input Objects
The physical input Object represents the physical inputs of your MIDI interface; the
sequencer input represents Logic’s MIDI input. You can only have one of each of these
Objects in the Environment. The default sequencer input Object is named “to
Recording & Thru”.
To create either type of input Object, select New > Physical Input or New > Sequencer
Input. To make use of an existing Object, drag it onto the relevant layer. This will not
affect its cabling.
Physical Input Object
The physical input represents the MIDI inputs of your MIDI interface. Each song can
have only one physical input Object. You only need to create a physical input Object if
you have deleted the one that existed when the song was created. Do so by selecting
New > Physical Input.
The physical input Object receives MIDI signals from the inputs of the MIDI interface(s)
connected to your computer.
Sequencer Input Object
MIDI events arrive at Arrange window tracks thru the sequencer input Object. If
nothing is cabled into the sequencer input Object, nothing can be recorded in Logic.
Typically, the physical input Object is cabled directly to the sequencer input Object but
other Objects can be inserted between them. Typical candidates are; a monitor,
keyboard, or cable switcher Object—feeding various processors such as an arpeggiator,
a delay line, and so on (See the Clicks & Ports layer of the Logic default Song.) You can
also cable the output of complex Environment processes into the sequencer input
Object, in order to record the processed signal.
Each song can have only one sequencer input Object. You only need to create a
sequencer input Object if you have deleted the one that existed when the song was
created. If you do need to create one, select New > Sequencer Input.