Convert Audio to 0-4VDC for Animatronic Control 2014-06-28

I have built an animatronic figure and wanted to synchronize its mouth movements to an audio signal. The mouth is operated by a servo motor controlled by a Lynxmotion SSC-32 controller. The SSC-32 has an on-board A/D converter.

I am an electronics hobbyist with no formal training. I have been able to construct some digital designs, but this is my first foray into the world of analog. I searched the web for relevant...

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