Introduction to Pro Tools : Keyboard and Mouse Shortcuts : Numeric Keypad Modes : Shuttle Lock Modes

Shuttle Lock Modes
There are two Shuttle Lock modes (Classic and Transport). Both modes let you use the numeric keypad to shuttle forward or backwards at specific speeds.
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1–4 provide progressively greater rewind speeds (4 is the slowest rewind Shuttle Lock speed, 1 is the fastest).
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Press 0 to stop Shuttle Lock, then press the number to resume Shuttle Lock speed.
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Custom Shuttle Lock Speed
(Pro Tools HD and Pro Tools with Complete Production Toolkit Only)
The highest fast-forward Shuttle Lock speed (key 9) can be customized.
Classic Mode
This mode emulates the way Pro Tools worked in versions lower than 5.0. With the Numeric Keypad mode set to Classic, you can:
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Play up to two tracks of audio in Shuttle Lock mode. Press the Control key (Mac) or the Start key (Windows), followed by 1–9 for different play speeds.
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Press 0 to stop Shuttle Lock, then press the number to resume Shuttle Lock speed.
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Recall Memory Locations by typing the Memory Location, followed by a Period (.).
Transport Mode
This mode lets you set a number of record and play functions, and also operate the Transport from the numeric keypad.
 
With the Numeric Keypad mode set to Transport, you can also:
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Play up to two tracks of audio in Shuttle Lock mode. Press the Control key (Mac) or the Start key (Windows), followed by 1–9 for different play speeds.
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Press 0 to stop Shuttle Lock, then press the number to resume Shuttle Lock speed.
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Recall Memory Locations by typing Period (.), the Memory Location number, and Period (.) again.