Paintbrush selection needs an adjustable feathering option
We have Size and Opacity which are fine, but for the purposes of selecting a frequency-steady background noise, it would be much better if the painted selection could be made with a feathered edge, just like a brush in Photoshop, such that any changes made to the selection would decrease towards the outer edges of the selection.
This would allow for smoother changes, as currently a change will effect 100% of the selected area, and anything outside will be 0% changed. This can result in a harsh, unnatural transition between frequencies.
This is sort of what the Opacity control is for. The lower the opacity of the selection, the less processing is applied. I believe there is an "auto-feather" item in the backlog, though. Let me take a look and update it with your comments.