Quentin Sculo has added equalizer preset and edit/save preset functions to GMB.. you will need to add these capabilities to any layouts you use. They will be included on the next ISO as defaults with the VSIDO layouts in GMB
Once you have done a git pull and added the latest GMB code, just add this to the bottom of whatever layout you use ... Once it is there when you open Equalizer in GMB, there is a dropdown menu of the presets and the edit functions
Window = size=300x160,uniqueid=Equalizer,ifexist=replace
VBmain = 2EqualizerPresets _Equalizer
Title = _"Equalizer"