Gibson, at the direction of Keith McMillen (Gibson's vice president and chief of R&D), then produced the Oberheim OB-Mx in collaboration with D.N. "Lynx" Crowe and Don Buchla; the Oberheim Echoplex Digital Pro in collaboration with Aurisis Research (Matthias Grob, Kim Flint, Eric Obermühlner); and re-released the Oberheim Strummer and Matrix 1000. Gibson had split from its parent company, Norlin, in 1986. Norlin handled distribution for Oberheim's major competitor, Moog Music. The trademark was later licensed to Viscount International, an Italian digital-organ producer. Viscount developed in a few years various instruments that were very innovative for the time and are still in demand: the digital synth Oberheim OB*12, the guitar DSP GM-1000 with many effects, the MC series of master keyboards, and the OB32, a portable and inexpensive imitation of the popular Hammond series of organs. In 2009, Tom Oberheim announced that he was manufacturing a new version of his classic analog SEM. In 2011–2012, Tom Oberheim announced a four-voice SEM called "Son Of 4 Voice" (SO4V), as well as an updated version of the classic Two-Voice known as the Two-Voice Pro. The "Son Of 4 Voice", also known as SO4V, the Two Voice Pro started shipping in 2014. At the NAMM show of January 2016, Tom Oberheim announced the Dave Smith Instruments OB6, a collaboration with Dave Smith which resulted in Tom Oberheim's first voltage-controlled multi-voiced polyphonic synth since the mid-1980s; Tom Oberheim designed the VCO/VCF part replicating his SEM module, while control features, arpeggiator/step sequencer and effects processing were designed by Smith using his Prophet platform. In July 2019, JC Curleigh, CEO of Gibson, returned the Oberheim Electronics brand and IP back to Tom Oberheim as "a gesture of goodwill to the musical instrument industry."