 Another new feature to the OB-Xa is a second filter mode labeled "4 Pole".In 2017, Behringer announced it would replicate the CEM3340 VCO chips used in the OB-Xa synthesizer.The widow of chip creator Doug Curtis released a statement clarifying that the replica was made without permission and that Curtis "would be deeply saddened by the attempt of others to trade on his name and to make unsubstantiated claims of equivalency to his original inventions".