The Apple II series of computers, which did not have sound capabilities beyond a beep until the IIGS, could use plug-in sound cards from a variety of manufacturers. The first, in 1978, was ALF's Apple Music Synthesizer, with 3 voices; two or three cards could be used to create 6 or 9 voices in stereo. Later ALF created the Apple Music II, a 9-voice model. The most widely supported card, however, was the Mockingboard. Sweet Micro Systems sold the Mockingboard in various models. Early Mockingboard models ranged from 3 voices in mono, while some later designs had 6 voices in stereo. Some software supported use of two Mockingboard cards, which allowed 12-voice music and sound. A 12-voice, single card clone of the Mockingboard called the Phasor was made by Applied Engineering. In late 2005 a company called ReactiveMicro.com produced a 6-voice clone called the Mockingboard v1 and also had plans to clone the Phasor and produce a hybrid card user-selectable between Mockingboard and Phasor modes plus support both the SC-01 or SC-02 speech synthesizers.