In AVAudioSession class there are various categories to handle playback http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVAudioSession_ClassReference/Reference/Reference.html . In this if you use AVAudioSessionCategoryPlayback you will get higher playback sound compared to other categories like AVAudioSessionCategoryPlayAndRecord. Also there is a setVolume: property for AVAudioPlayer.
If you need more control over your audio you can use Core Audio framework. Please refer http://developer.apple.com/library/mac/#documentation/MusicAudio/Reference/CACoreAudioReference/CoreAudioTypes/CompositePage.html and the sample Speak Here application http://developer.apple.com/library/ios/#samplecode/SpeakHere/Introduction/Intro.html for more details. Hope this helps you.
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