The Boss SD-2 Dual Overdrive was one of the more short-lived pedals that was part of the first post-Japan production run out of Taiwan. This pedal had two separate shapeable overdrive circuits.
This thing has two channels right? Well, the crunch mode isn't very inspiring at all, infact i want to mod it. It's kinda harsh and buzzy no matter how i tweak it The lead side worth the climb. This is certanly one of the most powerful marshall sounding lead distortions i've ever heard, and i've heard many.
Like most folks out there, I really like the lead distortion mode. And yes, the "crunch" mode leaves a lot to be desired. However, I have found a use for Crunch mode: lowering the Drive and cranking the Level up makes for a nice boost, especially on tube amps.