Introducing the all new OP–1 field. injected with more than a decade of ideas, refinements and improvements. just to mention a few: stereo throughout the whole signal chain, bluetooth midi, usb type-c, a new speaker system with a passive driver for detailed, fat and loud sound, a massive 24 hour battery life, multiple tapes and recording formats, new great sounding reverb and the 'dimension' synth engine, an all glass, flush, high resolution display. we also meticulously reworked all graphics, screen by screen. did we mention fm broadcasting? well, that's just some of the 100 new features reworked, refined, reborn. think of OP–1 field as the natural continuation of its predecessor. updated with the latest technology, improved design and finely tuned with  professional musicians, recording artists and sound designers in mind. higher quality in all aspects, from its circuitry to connectivity and flexibility, it's tailor made for professionals in the field.   if it feels thinner. it is.   They didn't want to alter the original OP–1 too much, because they think they got it  more or less right the first time; but by lowering the aluminum body around the keyboard, the new OP–1 field feels lighter, thinner and more precise. with 2k molding they also managed to fit a dual 2.4 GHz  antenna system inside the aluminum body.   the back is warm, velcro and bass.   They added two soft velcro rings on the back for fastening covers and accessories. perhaps you want to stick your OP–1 fiel