Playback and Recording : Audio Recording : Half-Speed Recording

Half-Speed Recording
Pro Tools lets you play and record at half-speed. This capability is similar to that of a tape deck where you can record material at half-speed and then play it back at normal speed (faster and up an octave), or record material at normal speed and play it back at half-speed (slower and down an octave), for special effects.
Use half-speed recording to record difficult to play MIDI tracks or to record complex automation moves.
To record at half-speed:
1 Record enable the tracks you want to record at half-speed.
2 Click Record in the Transport to arm Pro Tools for recording.
3 Press Command+Shift+Spacebar (Mac) or Control+Shift+Spacebar (Windows). Recording begins and all existing track material plays at half-speed.
4 When you have finished recording, click Stop.