


Have you considered hardware EQ? I have seen engineers tweak hardware equalizers without looking at them, because they know where the controls are and the knobs often have tactile feedback such as notched positions. The visual aspect of parametric equalizers is really just a convenience, or at least it's a convenience for sighted people. But the fact that each filter has specific parameters means you don't technically have to see them to manipulate them. I'm no expert, but I think the best approach for a non-sighted person is probably the good old parametric (or paragraphic) equalizer. It's meant to be used in conjunction with the traditional "spectral editor", an equalizer.

A spectrum analyzer (usually) is not an editor, but rather just the visualization part. That is kind of the definition of a spectral editor: a visual representation of the spectrum that can be manipulated visually. I am having trouble imagining a spectral editor that isn't visual.
