“I think having the sweep able mid is the key ingredient to this sound”
In Metal types of sounds I think of a lot of Bass and swept Mids. Now that can be tricky because too much bass can give you a flubby, mushy sound. Again, like the gain I would start low and bring it up until it sounds good to you. For that Metal sound I think of a Thump and Sizzle sound which means a lot of bass and treble. I would get the Treble level set so that it is even in sound to the Bass. Now come the mids come in and this is where it gets fun! The guitar really lives in this range. To get that thump and sizzle we need to pull the mids out. Next you can use the mid frequency control to find that perfect sound, use your ears on this one. I think having the sweep able mid is the key ingredient to this sound. After finding that frequency then I would slowly bring the mid frequency up enough so that your guitar can still cut through.
There is a lot of way to get a good “Metal” sound but for me using a high gain pedal with a 3 band EQ with a sweepable mid control is the best and easiest way to get there.