A four-pole, lowpass VCF integrated circuit, produced by SSM in the late 1970s and 1980s. It was widely used in polyphonic synths of that era, including the Rev 1 and 2 versions of the Prophet-5, the Crumar Bit-01 series, the Korg Polysix, the PPG Wave 2.2 and 2.3; the Voyetra-8, and some versions of the Fairlight CMI. This IC is rare now, but can still be found, although it should be reserved for repairing vintage synths.
In 2107, a company called Sound Semiconductor launched the SSI 2144, a re-engineered version of the 2044. The 2144 is functionally similar to the 2044, enough so that it can replace the 2144 (with some trimming of the circuit) in existing designs, as well as providing some additional features in new designs. The 2144 has a different pin arrangement than the 2044, but AMSynths markets an adapter for it.