A shorter filter length may sometimes be preferable.

As a result, the green curve will fit to the blue line less closely at any given 'Length of filter' than for lower sample rates.

At high sample rates the actual time represented by a given number of samples will be less and the frequency bands will be broader so as to cover the increased frequency range.

Higher settings will process the audio in a greater number of narrow frequency bands, but may introduce ringing artifacts at very high settings. If the green curve Audacity uses to perform the effect is very different from the blue curve you created, try increasing the length of the filter. Generally, it's best left at the default value of 4001.

Length of filter: How many samples of audio Audacity processes in each analysis step.Graphic EQ: This button switches to the simpler ' Graphic EQ' mode, in which the equalization curve is drawn by adjusting the frequency sliders.Draw Curves: Selecting this radio button gives you the ' Draw Curves' mode, in which the equalization curve is drawn by manipulating control points.This control is available only in ' Draw Curves' mode. This can be useful for precision adjustments at high frequencies. When checked, the frequency scale is linear, displaying equal frequency ranges for each unit of the scale. This corresponds roughly to our greater sensitivity to lower frequencies. Linear Frequency Scale: When this box is unchecked, the horizontal frequency scale is logarithmic, giving more detail at the lower frequencies.

The green curve usually follows the blue curve closely, but will be forced to a smoother path if there are sudden changes in amplitude over a small frequency range. The green curve is the one that Audacity actually uses to perform the effect, taking into account the limitations of the equalization algorithm. To remove a control point, drag it outside the graph. Doing either creates a control point at that position, then creating further control points draws the curve. When in ' Draw Curves' mode, the blue curve is drawn by either clicking in the graph at any position, or clicking on the blue curve and dragging it to a position. The white circles are called 'control points'. Equalization Curves and Control Points: If you look closely at the curve in the image above, you'll see it's composed of a blue curve joining together a number of white circles, and a green curve which follows the general shape of the blue curve.

Audacity eq presets