Here is a link to the RX Audio Cookbook for spectral audio correction:

Here’s a copy on the home page as well.

Welcome to the iZotope RX Audio Cookbook

The iZotope RX Audio Cookbook is designed to help you find solutions or ‘recipes’ for solving common audio problems. Each recipe includes step-by-step directions, before and after audio examples, illustrations and tips for solving stubborn problems.

As you work through the Cookbook, be sure to send us your feedback.