F. S. Blumm and Nils Frahm have confirmed details of their fourth collaborative album, 2X1=4, which will be released on September 3, 2021, by LEITER, the new label formed by Frahm and his manager, Felix Grimm in cooperation with BMG. The seven-track album finds the duo unexpectedly exploring a dub-influenced universe, though in truth it's one already familiar to both. F. S. Blumm, for instance, is cofounder of Quasi Dub Development, whose 2014 album, Little-Twister vs Stiff-Neck, featured Lady Ann and Lee Scratch Perry, while Frahm's music - not least 2018's All Melody - has occasionally betrayed a fondness for the form's associated studio techniques, though he concedes wryly that his approach has always been "a little bit more German" than his influences.