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Hello :)

why the span is adjusted so that it does not show a flat chart, on the pink noise , ???


You can change that behavior in the Spectrum Mode Editor by setting the Slope to a different value.

I know that I can, but why do you set the slop like this, it also applies to other Voxengo plug-ins, must be the reason why the slop is set as it is

The reason is that higher frequencies in musical material are usually diminishingly less powerful than lower frequencies.  Without such slope it may be a bit hard to monitor the higher frequencies.  Moreover, classical analog spectrum analyzers have a natural +3dB/oct slope toward the higher frequencies.

If you wonder why it's +4.5 dB/oct instead of +3 dB/oct, the reason is the same - because for musical signals it's more practical.
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