This update from Apple will improve the functionality of this app. No new features are included.

Important update to address bugs.
-repaired Honey Med sound file
-fixed audio playback glitches
-fixed sound fading while scrolling
-fixed glitch when rapidly changing fans
-fixed timer persistance
-fixed play/pause operation from lock screen
-oscillation is now off by default
-improved user recording experience
-updated interface controls

+ Increased Volume - all sounds are now much louder
+ 3 new fans added - now 17 built-in fan sounds.

Updated for all new device screen sizes.
Includes 14 built-in fan, 5 ambient, and 3 alarm sounds.
Fans playback in 3D sound with adjustable oscillation.
Add your own sounds (fans, ambient, alarm).
Add picture and text to your sound recordings.

Major Update - Improved Multitasking for iOS5
Richly Textured Brushed Metal User Interface
Retina Support for your iPad, iPhone and iPod Touch
Auto-Timer Provides Endless Background Play
Added Monochromatic Blade
Play-Pause, Fan Speed Control via Remote Control

★ New, more realistic fan sounds
★ White noise (user mixes)
★ Updated icons and graphics
★ Now 3 fan blade styles
★ Supports rotation (iPad)

 ★  FOR BACKGROUND OPERATION ★
  You must add time on the timer to allow fan sound in sleep or while in background.