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Export: Export the curves selected in "Manage Curves" to a new XML file.Import: Import new presets from an XML file, adding them to the current list.
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Move Down: Move the selected preset down in the list.Move Up: Move the selected preset up in the list.To negate incorrect RIAA equalization of a 78 rpm record that was recorded with a modern turntable, you can apply the already supplied "Inverse RIAA" curve in the "Select Curve" drop-down, without using the "Invert" button. Invert: Turns the current curve in the window upside down, changing positive gains at a particular frequency into negative, and vice-versa.This means the curve on the graph is drawn from left to right at 0 dB on the vertical scale, so that no frequencies will have their volume level modified. Flatten: A quick way to set a "level response curve".Save/Manage Curves: This brings up the "Manage Curves" dialog.In that case Audacity will put a point in at 20 Hz at the dB level you wanted at 10 Hz. For example, if you have a point at 10 Hz in a curve saved in linear view (where the scale starts at 0 Hz) then switch to logarithmic view (where the scale starts at 20 Hz), the curve will switch to "custom". Any curve in either mode will display as "custom" if there are points in the curve that are outside the range of the Horizontal Scale.If that curve is loaded in "Graphic EQ" mode and then switched to "Draw Curves", it will display as "custom". In "Draw Curves" mode, a curve created in "Graphic EQ" mode can be displayed as its saved name if loaded from within "Draw Curves". In "Graphic EQ" mode, only presets saved in that mode will display with their saved name. Your own saved presets will always display with their saved name if loaded in the same mode you saved them in.In "Graphic EQ" mode, built-in presets will display as "custom" because they were built using the differently calculated "Draw curves" mode.There will also be the following instances where curves can only be matched approximately, so will display as "custom": A curve will display as a "custom" curve if it is not yet saved as a preset, or if it is a modified preset. These could be used to equalize an LP or 78 rpm disk recorded into Audacity without equalization. These are either your own saved presets (see "Save/Manage Curves" below) or built-in presets, mostly playback equalizations for gramophone records. Select curve: Click the drop-down triangle to select from a list of preset equalizations.Also, using a shorter filter to produce a smoother green curve may actually sound better, unless you are modifying very low frequencies. Note that the effect will take longer to process with a longer filter. However 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: Sets how much audio Audacity processes with each 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 unchecked, 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.