TunePad is an OS X application that allows you to easily make beats or complex melodies.
Simply draw patterns using your mouse on the TunePad grid and listen to your composition as you create them.
TunePad is also available for iOS devices.
NOTE: To buy TunePad via the App Store, an Apple account is required.
Here are some key features of "TunePad":
· Save the resulted tunes
· Load and edit tune
· Change the beats per minute
· iTunes Plus sound quality
· 20 x 16 grid format with 20 different notes
· 64-bit processor