An XML driven iPhone audio application

I require bids for an iPhone application that plays simple audio files. The application must be scalable to handle over 500 audio files. Each audio file has a english text and a translated equivalant. These are grouped into categories and all assets must be contained within the application and I therefore require advice on reducing file sizes of audio clips to avoid any limitations of iphone apps. It should all be loaded from XML and there will be one button which prompts for text input and retrieves data from a google API. This should work independantly of the audio playback. Please refer to [login to view URL]\_release\_id=373 to get a better idea of what's invovled. I'd require signing of an NDA and subcontractors agreement in order for work to commence. Thank you for bidding.