The Eruption solo is really not that difficult to play if you're a basic metal guitarist with a knowledge of standard shredding licks. It's just that 30 years ago nobody had ever heard anything like that! Here's the way to get the sound: a Marshall JCM 800, or 900, series head with spring reverb, a Marshall 4 12 cabinet with 30 watt Celestions, and a Kramer Striker guitar with Floyd Rose whammy. It won't sound like Eruption on any other brand of guitar, cause Eddie only played Kramers at that time. Also two pedals, an MXR Phase 90 analog phase shifter, and a Boss Digital Delay 3. What's the DD3 for? The biggest secret of all! At the end of the solo you hear a low E note rising and then dropping to a slow crawl. Almost like slowing tape reels down. Set the digital delay to reverse mode, turn up the repeats to full, and the delay time to minimum. Now after the solo is done, play the open A string to E on the 12th fret, and immediately switch the pedal on, let the note sustain for a while, and then gradually turn the delay time to full, and you will get the effect of tape reels slowing down to a lower octave, but in the same key. You have to hit the pedal just at the right time though to get the sustain on the E note but with practice you'll get it. That's how Eddie did it, everyone thought it was a whammy bar, but it was not! The guy was just a musical genius to come up with techniques like that. And as for the Phase shifter, set it to the slowest speed possible, and run it before the delay pedal. And set the overdrive gain control on the amp to about 2 o'clock and the reverb control to about half, and have fun playing Eruption, one of the greatest metal shredding solos of all time!