This effect gives you graphic-equalizer control over your wave file. The different sliders correspond to different frequency bands -- move a slider upwards to increase the loudness of that particular band, down to decrease its loudness. The slider on the far left corresponds to the lowest frequencies, the slider on the far right the highest.
The equalizer has three ranges: bass, midrange, and treble. The bass is covered by four bands (31-, 62-, 125-, and 250-Hz). The midrange is covered by four bands (500-, 1000-, 2000-, and 4000-Hz). The treble is covered by two bands (8kHz and 16kHz).
Note that this equalizer feature affects the wave file directly, not just the way your speakers respond to it, and any changes you make will directly alter your wave file.
Options
Band gain - Each band has a slide control associated with it. The slide controls are marked with the center frequency of the band (expressed as Hz), and the band's gain (expressed in db or decibel). A gain of 0 db indicates no gain; positive values indicate amplification, negative values indicate attenuation. Please note that any scale marked in db is logarithmic, that is, non-linear. Note also that db expresses ratio. Hence it is not a unit of an absolute system of measurement, but is a unit of a relative system of measurement.
The center position of the slider control represents 0 db, the topmost position represents +10 db, and the lowermost position represents -10 db.
Stereo Options - if the wave file is in stereo, you may select which channel(s) to apply the equalization to.