Resonance Tuning is a process that was discovered in the mid 1990s as one way to balance biological energy fields. While there is no objective evidence that this is being accomplished, the clinical results that many people are getting are consistent with the theory. Using a Resonance Tuner in the form of a small card, people can take a more active role in their own healing, whether physical, emotional, energetic or spiritual. This article briefly reviews how the process was developed, based on another process the author first encountered in 1978. The second part of the article contains feedback from people who have used the Tuner in the four and a half years since it first became available. The comments represent a cross section of many different areas in which the Tuner has been valuable as a tool for healing, both by itself and in conjunction with other healing modalities.