Article: It will be highlighted in yellow to indicate that it is selected. It's the icon that resembles a speedometer above the previewer. ".  It's above the previewer at the top.  These buttons are located next to the pulldown menu above the previewer.  This will determine how much you speed up the audio by. This will prevent the pitch from raising as the audio speeds up.

What is a summary?
Click an audio clip in the timeline. Click the "speed" icon. Click the pulldown  next to "Speed: Click Fast in the pulldown menu. Click 2x, 4x, 8x, or 20x. Click the checkbox  next to "Preserve Pitch" (optional).