So ive wondered if my comparisons of the beastbox and engl e530 have been accurate, so today i A/B them back to back going into my mesa 50/50. Long story short, i was wrong. To my ears they sound essentially identical. The only EXTREMELY slight difference is that the beastbox is a hair brighter. The e530 treble was at 1:30/2o clock and i got the same result on the kartakou with treble at noon. The other super negligible difference is in the lowend, the engl has an ever slightly more chewiness in the lows, almost hard to notice. I figured id try the depth finder after the beastbox to see what happens, presence off, resonance at 10/11 o clock and it made them indistinguishable. I think i can honestly say that the beastbox is the best preamp pedal ive ever played. Bit biased of course as im a huge fan of that chewy super saturated engl tone. Plus out of all the amps etc i have the engl e530 was the most pleasing to my ears so i guess its inevitable i love the beastbox. I have to say kartakou is a special company, vasili definitely knows what hes doing!