Android Music Instrument App Development

We need a developer who can help us build a simple music instrument application (one single instrument) for Android phones. Our company will handle graphic and audio production for the project, we need a developer to help us build and code it. We are familiar with Flex builder 4.5 but are open to suggestions in regards of software used to build the project. Functionality wise, the application is a wind instrument that will need to feature touch interaction for playing notes in combo with using the microphone for detecting the user blowing. User will need to be able to load a start screen that features select an instrument (2 different graphical versions of the same instrument), & share on facebook. Once selected the user can play their instrument or go back to the start screen. A thorough description of the project with full functionality will be provided once the bid is accepted & bidder has agreed to an NDA (non-disclosure agreement).