The present disclosure relates to audio mixing and editing devices and methods. Two half ring sections protrude from peripheral edges of central circular cut-outs at opposed ends of the semicircular closing plate sections. The drive motor provided is in the form of a torque motor having a stator housing, a rotor, which is rotatably arranged in the stator housing, and at both ends of the rotor, outside the stator housing, a drive pinion meshing with a crown gear. The invention further refers to aqueous colloidal dispersions of polar lipids including galactolipids, to an oil containing polar lipids including galactolipids and to pharmaceutical, cosmetic and food compositions including such dispersions andor oil.