The bottom speed fader changes the playback speed of the audio device. Move the fader right to increase the speed or left to decrease it. The relative speed is shown numerically to the left of the fader in a popup tip window. Right-click on the fader to display a popup menu to quickly set the speed to commonly used ratios. Note that changing the speed also changes the pitch like spinning a vinyl record faster or slower. To change the speed of the file, use the effect instead.