You know, there are rip-offs, and there are rip-offs. Our Finnish friends Farmakon make little or no effort to prove they are anything but an Opeth tribute band in hiding, with Robin being the ill-begotten follow-up to 2003’s very Opeth A Warm Glimpse. It’s all here: the winding, neo-prog guitar riffs, the somber acoustic passages, which really aren’t anything to get excited about, tender clean vocals, gruff, dirty vocals, and those trademark Ake…