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This application, released as free software under the GNU GPL v2 for Linux and Windows, is designed for getting a rapid visual understanding of recorded brain-wave data. It uses FFT-accelerated convolution to do the analysis, which enables much greater flexiblity than using the traditional FFT-of-windowed-data approach. The frequency is plotted on a log scale, which is much better for viewing data that includes a wide range of frequencies. The window size is proportional to the wavelength at any frequency, so the convolution is effectively being done with a complex wavelet at various different scales. (Another way of putting it is that the analysis is effectively being done with the front half of a digital heterodyne filter.) The ratio of window size to wavelength can be varied easily to allow different aspects of the data to be shown.