Music Pad Pro: Portable music synthesizer.

(+) Music Pad Pro is a portable music distortion synthesizer for live performance or personal entertainment.

(+) It has very popular touch and play feature
(+) It supports multitouch/multitasking.
(+) Sound quality is very good.
(+) Gives output to internal speaker and can also connect to loud
speaker or midi input using iPad standard output port.
(+) Lock/Unlock feature to customize functionality.
(+) Easy designed for musicians and music lovers.

Nothing to say more, try it yourself, surely you will have fun