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So the bad news is, it’s virtually impossible to tell what the distortion pedal sounds like without auditioning it personally.
The two most important effects in a guitarist’s signal chain are distortion and delay. And if you derive your tone strictly from the amp—whether it’s squeaky clean or buzzsaw nasty—then the digital delay is numero uno.
A lot of guitar multieffects have a footpedal that can be assigned to various parameters. Volume and wa are no-brainer pedal assignments, but there are a whole lot of other parameters that are well-suited to pedal control. Doing so can add real-time expressiveness to your playing, and variety to your sound.
If you're a guitarist and you're not into multiband distortion...well, you should be. Just as multiband compression delivers a smoother, more transparent form of dynamics control, multiband distortion delivers a "dirty" sound like no other.