Time Stretching Sounds (FlexAudio™)
Time travel may not be possible yet, but you can change the speed of a sound without changing its pitch.  :)  In the past, changing the speed or playback rate of a sound resulted in changing the pitch, also known as the dreaded "chipmunk" effect.

Time Stretching Sounds
Each sound can be time stretched with or without changing its pitch.A sound can be adjusted by 25% to 400% which would result in a sound four times as fast or four times as slow.  You can visually time stretch a sound with FlexAudio™, described below.  Otherwise, click on the Sound Details Tab on the bottom and select the sound you are interested in adjusting.  

Make sure to switch the sound from Adjust To Project Tempo to Time Stretch By mode, if it's not already in that mode.  



Adjust the sound to the desired percentage.  Setting it to 50% would cause the sound to be 1/2 the size and playback two times as fast.

If you want the sound's tempo to slow or speed up over time or beat match, you should change the sound's mode to Adjust To Project Tempo on the Sound Details Tab and add several successive tempo markers to the timeline.

FlexAudio™
FlexAudio™ is Acoustica's trademarked way to visually time stretch a sound clip.

In this example, the sound is around 14 seconds long and we'd like it to be 10 seconds.  



While holding the Ctrl key down, click on the right edge and move your mouse left to the 10 second mark on the time line.
(You will know that you are in FlexAudio™ mode if the cursor turns into the FlexAudio™ cursor .)



The sound will now play in 10 seconds, instead of 14 seconds!  

Tips With FlexAudio™
Use FlexAudio™ to create perfect loops.  If you have a loop without a detected tempo, set the snap to measure aligned.  Use FlexAudio™ to snap the sound to the nearest measure.  Loop the sound first to make sure all loop points line up.  Now it should be in perfect synchronization unless there are tempo changes during the loop, in which case, you should figure out the actual tempo of the sound.  

Once FlexAudio™ helps you figure out how much to time stretch the sound by, you can set the tempo with a simple calculation.  Just find the tempo of the closest tempo marker before the sound's start in this calculation.  Tempo of sound = (Project Tempo) X (Sound's Time Stretch Percentage) / 100.0 .  Switch the sound to Adjust To Project Tempo and then type in your new tempo.

If you have made a commercial and it needs to fit in exactly 30 or 60 seconds and you are over by a few seconds, just time stretch it with FlexAudio™.  Have you ever heard one of those legal disclaimers?  They are inhumanly fast and it is due to a sound being time stretched by about 75%.  Turn off snapping and FlexAudio™ it to the desired length.

Time stretching can be set from 25% to 400%.  However, in most cases, it will only sound good from around 75% to 125%