Tap the speedometer icon shown at the top of the screen to set your custom playback speed. Your current speed will show in the window, choose a preset speed or fine-tune your speed with the slider. When you're finished, tap "hide." Your custom playback speed will show beneath a speedometer icon in the player.
If you'd like to set a sleep timer, tap the moon icon. Your current selection will show under pause playback. You can choose a preset or fine-tune with a slider. When you're finished, tap "hide" once the sleep timer has been set. Your remaining time will show beneath the moon icon in the player.
Listening settings are sticky for the device you're using. When you open another audiobook on this device, your custom playback speed will be applied, and you'll tap the moon icon just once to begin your sleep timer.