ToneTrend is a simple biofeedback application that provides music, video, DVD, and tactile feedback.

ToneTrend can help you develop an increased ability to control tension and stress by providing a way to increase your awareness of your mind and body's internal state.  ToneTrend enables a person  to easily perceive increases and decreases in their body’s arousal level by providing visual and auditory feedback in relation to those physiological changes.

download ToneTrend
(version 1.4.0)

1 – Start / Pause button - Used to start and stop the training.
2 – Audio Signal Display - Displays the incoming audio signal’s pitch on a line graph.
3 – Immediate Success Indicator - Shows the current degree of change compared to an average for the last five seconds.
Green = succeeding.  Red = failing.
4 – Sustained Success Indicator - Shows the overall success.  Goes up when succeeding.  Goes down when failing.  ToneTrend’s sensitivity to success and failure can be manually adjusted.
5 – Timeline scrollbar - Can be used to increase or decrease the amount of time displayed in the Audio Signal Display window by dragging the edges of the bar.  It can also be used to scroll around in the range.
6 – Pitch Range scrollbar - Can be used to widen or narrow the frequency range displayed in the Audio Signal Display by dragging the edges of the bar.  It can also be used to scroll up or down through the range set.

Support for ToneTrend can be found here.