Apple Logic Express 8 - Manual (Page 504)

504 Chapter 20 Editing MIDI Events in the Transform Window
Defining Operations
The Operations area is used to define the changes you would like to make—to events
that meet the selection conditions. As with the selection condition pop-up menus, you
choose an operation in the appropriate event parameter columns. One or two value
fields may appear, dependent on the chosen operation.
To define the operation for the status event parameter column:
m Click the pop-up menu, and choose one of the following operations for the Status
condition:
 Thru: The event type passes through unaltered.
 Fix: The event type is altered. Choose a new event type in the pop-up menu that
appears below the Status Operations menu. Choices include; fader, meta, note, poly
pressure, control change, program change, channel pressure, or pitch bend. This
effectively converts one type of event to another.
Note: When you convert note events, two events are created: one for the note on
event, and one for the note off event.
 MapSet: Choosing this setting means that events which match the Status condition
(note events, for example) are used to control the map of a subsequent operation—
in the Channel, Data Byte 1, Data Byte 2, and Length columns.
 The Data Byte 1 value selects the position in the map.
 The Data Byte 2 value determines the value at this map position.
Internally, Logic Express sends a meta event pair: #123 for the position, and #122 for
the value at this position. These types of meta events can also be created in other ways.
To define the operation for all other event parameter columns:
m Choose one of the following operations for the Channel, First or Second Data Byte, and
Length columns (as required). One or more value fields will appear below the
respective operations pop-up menus.
 Thru: The event passes through unaltered.
 Fix: Fixes the event parameter to the set value. You could use this to set the pitch of
all note events to a specific note value, making it easy to convert a bass groove into a
hi-hat pattern, for example.
 Add: Adds the value to events. As an example, a value of 8 could be added to all
incoming note velocity events, thus making the notes louder.
 Sub: Subtracts the value from events. You could use this to reduce all controller 10
(Pan) events, thereby narrowing the stereo spread of an electric piano part, for
example.
 Min: Parameter values lower than the defined value are replaced (by this value).
Larger parameter values are not altered. You could use this to replace all note
velocity messages below 45, thereby reducing the dynamic range of a MIDI region—
or put another way, making the soft notes louder.