Hearing is not as simple as having a microphone or a speaker. It involves a series of protein molecules of course, and the pathway is only partially understood:-http://www.the-scientist.com//?articles.view/articleNo/41527/title/New-Piece-of-a-Mysterious-Channel/-Nothing is very simple in biologic engineering. Note the specificity of each protein, and Wagner's theoretical approach is problematic in suggesting that gene circuits could find specific proteins in a specific series as needed. It is not just that a single 100 amino acid strand has 10^700 possibilities but there must be a series of these proteins to accomplish the task. this is why I do not accept natural causes for evolution.