Bug-Hunt-Two-SBS by LetsStartCoding

Cloned from Sketch Four_Note_Piano_with_LED_Synced-SBS by LetsStartCoding

This code has bugs! Find the flaws in this program and fix them to get a four note piano with synchronized LED.

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<iframe style="height: 510px; width: 100%; margin: 10px 0 10px;" allowTransparency="true" src="https://codebender.cc/embed/sketch:341990" frameborder="0"></iframe>

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