This is, as the name suggests, indeed one of the best distortion pedals for modern metal sounds; but it is also worth mentioning that with the gain set to zero, you could get a pretty thick and somewhat bluesy tone out of it.
close your eyes and go for it . if your a metalcore
With its extreme gain, the ML-2 is the most potent and heavy distortion pedal ever created by Boss. It easily delivers massive distortion and gain with heavy lows for playing Nu Metal, Grind core, industrial, hard core, or any genre that requires crushing sound.
If you want a pedal to make your guitar sound heavy? Buy this one and you will never look back. You will not getter better heavy riffs out of any other pedal!!!!
As I said the name says it all...its the very core of your metal tone...its heavy. its flat, its crunchy, its whatever you want from a Metal Distortion Pedal...Just think of it as Boss Turbo distortion pedal + Boss Overdrive Pedal + Boss Metal Zone pedal NOTHING MORE TO SAY :)