Sessions & Tracks : Pro Tools Main Windows : Transport Window : MIDI Controls

MIDI Controls
To view the MIDI controls in the Transport, do one of the following:
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Select View > Transport > MIDI Controls.
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Control-click (Windows) or Command-click (Mac) the Expand/Collapse “+” button in the Transport window to display the MIDI controls.
 
Wait for Note
When selected, recording does not begin until a MIDI event is received. This ensures that you begin recording when you’re ready to play, and that the first note, or other MIDI data, is recorded precisely at the beginning of the record range.
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You can press F11 to turn on Wait for Note, unless the MIDI preference for “Disable F11 for Wait for Note” is enabled.
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On Mac, the Desktop Keyboard Shortcut uses the same key command that Pro Tools uses for Wait For Note (F11). To use F11 for Wait For Note in Pro Tools, be sure to disable the Desktop Keyboard Shortcut in the Apple System Preferences.
Metronome Click
When selected, Pro Tools generates a metronome pulse that can be set to trigger built-in sounds or MIDI instruments during playback and recording.
The Pro Tools metronome is configured in the Click/Countoff Options dialog. Double-click the Metronome Click button to open the Click/Countoff Options dialog.
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With the Numeric Keypad mode set to Transport, press 7 to enable the Metronome Click.
Count Off
When selected, Pro Tools counts off a specified number of measures (indicated in the button) before playback or recording begins.
Double-click the Count Off button, to open the Click/Count Off Options dialog.
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With the Numeric Keypad mode set to Transport, press 8 to enable the Count Off.
MIDI Merge
When selected (Merge mode), recorded MIDI data is merged with existing track material. When deselected (Replace mode), recorded MIDI data replaces existing track material.
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With the Numeric Keypad mode set to Transport, press 9 to enable MIDI Merge.
Tempo Ruler Enable (Conductor)
When selected, Pro Tools uses the tempo map defined in the Tempo ruler. When deselected, Pro Tools switches to Manual Tempo mode and ignores the Tempo ruler.
In Manual Tempo mode, you can enter a BPM value in the tempo field, or tap in the tempo with the T key on your alphanumeric keyboard.
Current Meter
Displays the session’s current meter based on the play location. Double-click the Current Meter indicator to open the Change Meter window.
Current Tempo
Displays the session’s current tempo based on the play location. In Manual Tempo mode, you can enter a BPM value into this field, or manually tap in a tempo with a computer keyboard or an external MIDI keyboard.