ok if you have seen my previus post you know i am debating on which multi effect to buy and i decided to buy one of the boss me-50 or me-70 because i like that you don't always have to set presets for it. does anyone know of anything that sounds really bad about these pedals, also is there a significant reason to buy the me-70 over the me-50. i play mainly metal(metallica, slayer....(