feature request: Spectrogram Cutter : cut out specific frequencies regions per spectrum analyzer?

[Clemens-Ratte-Polle]

Hi. What about the possibility to cut out specific frequencies regions by time per spectrum analyzer? You could use a 2D or 3D spectrogram to cutout exactly what you want by manual drawing regions in the spectrogram. Here is a low quality manipulated example about what i mean: Spectrogram Cutter example

Image source : https://en.wikipedia.org/wiki/Spectrogram#/media/File:Waterfall_plot_of_a_whistle.png