Freeware that graphs the cumulative effect of the shelf and HP filters?

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I'm setting up the DSP on an inuke amp and want to graph the cumulative effect of shelf and HP filters which will together allow me to create a 15 Hz HP filter despite the 20 Hz lower limit of its settings.

The HP and shelf filters in the inuke are in different modules so I can only see the plots separately.

Does anyone know of any freeware (or cheapware, $20 max) that will do this?
 
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