I'm astonished that there's not a publicly available HX Stomp preset for the clean intro and outro on Nothing Else Matters. I'll try to upload a decent one later today. In order to build the preset I did some research, and discovered that the amp used by Metallica was a Boss Jazz Chorus, which has a Boss CE-1 chorus built in. Eureka! Also it helps if you can crank up the treble on your neck humbucker. The active pickups used by the band are very bright. I have a 2015 Les Paul Classic with a built in boost/buffer circuit that eliminates tone suck caused by distributed capacitance in the instrument cable, which really brightens up the 57 Classic pickups. They are so bright that I put metal covers on the pickups to reduce the treble a bit. You can also boost the treble on the amp model or add an EQ block if needed.