Here is a cassette tape demonstration of how speech can be enhanced using audio processing.

The original source was made in 1979 on a basic cassette recorder but suffered because of poor microphone placement.

Unfortunately many amateur recordings were spoiled because of this error.

With careful hiss and EQ adjustment a worthwhile result was achieved.

This process was all carried out with the addition of 'Cedar Audio' restoration and iZotope RX2 advanced software.

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Before

After

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