We have already seen the wonders of iPhone’s multi-touch user interface with native iPhone Applications like PocketGuitar which turns your iPhone or iPod Touch into a touchscreen guitar.

If that wasn’t impressive enough then you got to check out iAno – the newly released native iPhone application that turns your iPhone into a touchscreen piano.

The latest native iPhone application iAno makes use of iPhone’s revolutionary multi-touch interface and turns the iPhone into a four octave keyboard with realistic piano sampling sounds.

The thing that makes the native iPhone application developed by Mister Aardvark impressive is that the keys on the keyboard animate on touch and up to five keys can be pressed at once thus allowing complex chords. The application has on screen navigation buttons to allow users to easily move up and down the scales by octave or partial octave.

Another great feature of the iPhone application is you can play along with your MP3s.

Aardvark also plans on adding additional features such as a complete 88-key keyboard, switchable sample sets, recording and playback, as well as support for loading .MID tracks and playing them back.

You have to checkout the impressive video demonstration of iAno in action below: