So I compared your stealth version to the original AudioRecorder, deleting these 3 image files of recbutton(see as attachment) in AudioRecorder.app would do the work, right?
Exactly.
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So none of this works on iPhone 4?
Nope. iPhone 5+ only (and the 4S if you can use the speakerphone)
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I suppose they mean just remove the recording button without changing anything else.
Oops, sorry, I misunderstood the question. I'll promptly release such a version.