Choose Edit > Mode > Time (or click the Time Mode button in an editor's playbar) to create time selections by clicking and dragging in a waveform.
Perform any of the following actions to select data:
Click to position the cursor, hold the mouse button, and drag over an area of the waveform to select data.
If snapping is enabled, the selection edge will snap to marker/region tags and major divisions of the time ruler as you drag past them.
For more information, see "Working with markers and regions" and "Enable snapping."
Double-click the waveform to select sound data between boundaries: if the sound file has no markers or regions, double-clicking will select the entire waveform. If markers and regions are present, double-clicking between marker or region tags will select the waveform between the tags.
When markers and regions are present in the sound file, you can triple-click to select all data. Hold Shift while double-clicking to the right or left of a selection to extend the selection to the next region or marker.
When you are working with stereo or multichannel files, you can select data from the individual channels or all channels:
Drag within a channel to select that channel only.
Drag across channels to select multiple channels.
Drag along the divider between channels (or the loop bar above the ruler) to select all channels.
Hold Command and click a channel to add or remove it from the current selection.
Hold Command and Shift while clicking the first and last channel you want to select to select a range of channels.
Move the mouse over the edge of a selection. The resize pointer will be displayed.
Drag to change the length of the selection.
You can also drag the ends of the loop region to adjust the selection length.
Hold Shift while clicking the waveform to extend a selection to the point you click.
Hold Shift while double-clicking to select the entire waveform. If markers or regions exist, Shift+double click extends the selection to the previous and next marker/region.
Drag the center of the loop region to move a selection without resizing it:
Hold Option while dragging either end of a selection to move it.
Performing edits at zero-crossings reduces the possibility of introducing glitches in your sound file.
When snapping is enabled, you can also choose to have elements in the editor snap to zero-crossings. Choose Options > Snapping > Zero Crossings to toggle automatic snapping to zero crossings. For more information, see "Enable snapping."
If you want to manually adjust a selection to zero-crossing points, you can use the Edit > Selection submenu:
Choose Edit > Selection > Snap to Next Zero to force both edges of a selection to the next zero-crossing of the waveform.
Choose Edit > Selection > Snap Edge to Next Zero to force the active edge of a selection to the next zero-crossing of the waveform.
The active edge of a selection is defined by the blinking cursor. Press Home or End to change the active edge.
Before snapping to zero.
After snapping, the edges of the selection snap to the nearest locations where the waveform crosses the baseline.