Time stretching gives you control over the length of your sound or sounds. For example, if you have recorded an advertisement that is 1 minute and 4 seconds but it needs to be 60 seconds, simply enter the value 60 seconds and click OK. Normally, this could cause the sound to sound like a warped out dream or a chipmunk, but if you click the "Preserve Pitch" option it will preserve the pitch! This will take a lot more CPU and slow your computer down, but the effect is stunning and real time! (Note that depending on your computer speed, you may only be able to time stretch a few sounds simultaneously.)
Time Stretch
q By Sound Length – Enter in a new sound length and click Preview to hear how it sounds in real time. Click "Restore" to get it back to the original length.
q By Percent Of Original – Enter in a new rate. 100% would be the default normal speed. 50% is two times faster and two times smaller. 200% is two times longer and two times slower.
q Preserve Pitch – Click this to preserve the pitch. Note that this takes a lot of CPU power. (If this is not checked, the pitch will change as you change the length of the sound.)
q Click "Preview" to hear a preview of the sound at the new pitch.
To change time stretch a sound, select a sound and click "Time Stretch…" from the "Sound" menu.
Slow it down to 25% or speed it up to 4 times the normal speed!
You can also change the pitch of a sound. Select a sound and then select "Pitch Shift…" from the "Sound" menu.
q You can change a sound’s pitch by –24 to +12 semi-tones. (12 semi-tones = 1 octave)
q You can change a sound’s pitch by partial semi-tones. For example, you can type in "–1.43" semi-tones to shift the sound’s pitch down by –1.43 semi-tones.
q Click "Preview" to hear a preview of the sound at the new pitch.
q Click "Restore" to set the sound back to normal.
Thanks to Stephan M. Bernsee for the new time stretching routines! http://www.dspdimension.com