A "synth on a chip" integrated circuit produced by Curtis Electromusic in the late 1980s; it was one of the company's last designs. The 3396 implemented the same basic idea as the 3394; it contained waveform sources, a VCF, and VCA capaility all in one IC. A voltage-controlled mixer feeds a mix of the two generated waveforms to a conventional four-pole lowpass VCF. The output of this then goes to the final VCA section. The 3396 is unusual in having two VCAs in series; the first one accepts a linear control voltage, and the second one takes an exponential control voltage.