Text To Speech TTS and Playback

I want to create text files with multiple lines of text. Wish list below. I need assistance for the following * Convert text files to speech and create audio files * Audio files stored in dropbox * Playback on mobile device iphone/ipod/ipad/android * User has headphones attached to iphone/ipod/ipad/android * User can choose audio file using camera to scan barcode on mobile device iphone/ipod/ipad/android * Voice playback reads only one line of text. User can request repeat or user can request next line - prefer by predefined voice commands via bluetooth headset microphone - or bluetooth button/kepad * Choice of audio voice * Choice of playback speed * Choice of volume