Korg 707 FM Digital Performing Synthesizer

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The Korg 707 is the smaller, portable version of the DS-8 and is a digital eight-voice FM synthesizer designed using Yamaha components. Both models introduced an analog interface to control FM sounds and can play different patches on each of the eight voices.  The DS-8 is more generously equipped with performance buttons, an effect bypass and buttons to deactivate modulation by pressure or velocity per oscillator. 

Like the DS-8, the 707 is an eight-voice FM synthesizer with multi-timbrality, but with only a 4-octave keyboard with velocity response and aftertouch. It is equipped with two oscillators that have their own four-stage timbre and amplitude envelopes. There is a common four-stage pitch envelope and an LFO for both oscillators. The first oscillator offers the waveforms sawtooth, square, bright sawtooth and bright square, the second sawtooth and square with the option of cross-modulation selection. The timbre EG section has a master level control for timbre, an envelope for timbre shaping, an intensity parameter that adjusts the modulation effect of the timbre EG and a keyboard tracking function to shorten the envelope on higher keys and lengthen it on lower keys. The amplitude EG section offers a master level to balance the volume of the two oscillators, envelope rate settings and keyboard tracking. There is also a spectrum parameter for resonance effects and ring modulation. The 707 has performance controls for switching velocity, aftertouch, portamento and effects. (Source: Wikipedia)