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As you know, audio has a bandwidth of 20hz to 20,000hz. It can also be said that it has a bandwidth of 10 octaves. An octave does not have a predetermined value. A change in frequency of a multiple of 2, means a change of one octave. An octave has to have a starting point. If the starting point is 1000hz, one octave up is 2000hz. One octave down from 1000hz is 500hz. Equalizers commonly have one octave spacing between their slider controls.

The following screen caps are from a demo on the full version. The first one covers 1 octave. the second one covers two octaves.

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