The Pitch Bend effect changes the pitch over the length of the audio file with the help of a speed curve. The length of the audio file can be changed or retained.  
The following setting options are available:
Graph
Pitch
Shows the pitch over the length of the audio file.
Slider
Pitch Range
Sets the y-axis in the Pitch graph. The greater the value, the more noticeably the pitch can be changed.
Check box
Keep Length
Retains the length of the audio file. The x-axis in the pitch (output length) graph is fixed.
 


Pitch Bend