Unfortunately EQ isn't gonna cut it (pun intended) to "enhance" the sound of the GE64 tracks. What they're missing compared to modern day game music/GES tracks is dynamic range both in terms of instrument performance and mixing. What makes GE64 music awesome is the actual musical arrangement/melodies, while they're really flat and unexciting otherwise.
As for recreating the tracks using similar/identical samples, listen to Facility Classic - I *think* the samples were all recreated (for the most part) and then sequenced to match the GE64 original, and it still sounds pretty flat. For an example of what the classic tracks sound like with modern-day spice, listen to the Sole Signal remix of the main menu/folder theme, it absolutely nails that old/new sound.
There's also a couple recreations on YouTube, there's a Runway remix that is literally the exact same except with better instrument samples. Also Grant Kirkhope's Uncompressed songs are high quality too. I agree that the original songs sound a bit flat, however I feel like there's a certain charm to them. I listen to a lot of songs from old games like Mario 64 and Donkey Kong Country. While they're instrument samples are low quality/flat, they have specific "feels" to them that makes you recognize what game the song is from just by the instruments. It also helps that I've imported almost all the GE songs into SM64 to get used to how that game's instruments are. lol
@markpeter Could you include a version of that menu that doesn't have the gun, bullets and bowties (I'm assuming that's what those things on the left are), it's just that because I'm getting nostalgic vibes from this, I like it better without those things on the sides, but I know it looks a little empty without it so I figured an option to choose between the two would be great.