Apple Logic Pro 9 - Manual (Page 560)

To move a transient marker in an audio file
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Drag an existing transient marker to another position.
Note: The new position may or may not snap to zero crossings, depending on whether
“Snap Edits to Zero Crossings” is selected in the Edit menu. You can also Control-click (or
right-click) to open a shortcut menu and choose “Snap Edits to Zero Crossings.”
To delete transient markers from an audio file
Do one of the following:
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Double-click individual markers with the Pointer or Pencil tool.
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Click individual markers with the Eraser tool.
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Drag over multiple markers with the Eraser tool.
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Select an area of the audio file and press the Delete key.
This deletes all transient markers in the selected area.
Note: Transient markers are not actually deleted. Instead, their display threshold is set to
maximum, making them invalid. You can revalidate a transient marker using the plus (+)
button.
To detect transient markers in an audio file
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Choose Audio File > Detect Transients (or use the “Detect Transients of Audio File” key
command).
560 Chapter 17 Editing Audio in the Sample Editor