Specifications

Pro Tools Reference Guide174
playback) or DAE errors, since a DAT recorder or
CD Recorder that is idle can default to a differ-
ent sample rate or stop outputting a sample rate
clock altogether.
Half-Speed Recording and
Playback
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 (up an octave)
for special effects.
To record at half-speed:
1 Press Shift+Control+Spacebar (Windows) or
Shift+Command+Spacebar (Macintosh). Re-
cording begins and all existing track material
plays at half-speed.
2 When you have finished recording, click Stop.
When played at normal speed, the material re-
corded at half-speed plays twice as fast (up an
octave).
To play at half-speed
1 Press Shift+Spacebar. Playback begins and
track material plays at half-speed. Any audio
tracks recorded at normal speed will sound half
as fast and an octave lower, and any audio tracks
playing back that were recorded at half-speed
will sound like they are playing back at normal
speed.
2 Click Stop in the Transport window to stop
playback.
Use half-speed recording to record difficult
to play MIDI tracks or to record complex au-
tomation moves.
You can also play at half-speed by Shift-
clicking the Play button.
Use half-speed playback to learn or tran-
scribe difficult passages in recorded tracks.