What happens when you take 8 mono synths and use them together? Huge analog sound! This sound is the result of slight imperfections between each voice card and, because of some electronic components (mis)behavior, parts from the orginal circuit (notably the OB-X) caused all sort of distortion happening at different stages from filter to VCA and also at the output stage, OB-Xtreme place a special attention to the later with an emphasis on "the Growl".