Re: Wow! EQ'ing makes a big difference!
Oh, sure...
It's an AUV3 plugin from 4pockets called VisualEQConsole, and runs $6 US. Note that being a plugin it's not designed to run stand-alone and has to be run within an iOS host app - E.g. Garage Band, Cubasis, AUM (which is what I'm using and where I took the screen shot below). I know there are other similar products that are packaged as VST/AU plugins for desktop DAWs but they seem to be much more expensive in the $100-$150 range. Not sure if there are any hardware EQ's with similar features.
https://apps.apple.com/us/app/visual-eq-console-auv3-plugin/id1469451699Attachment:
VisualEQConsole.jpeg
It occurred to me last night that I have this at the end of the signal chain, after the other effects - just a bit of reverb & chorus on the melody side, and a touch of reverb on the bass. I'm going to explore the effect it has on the clean signal, and what a difference it makes putting it at the beginning of the signal chain. Should be instructive!