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The Philips SAA1099 sound generator was a 6-voice sound chip used by some 1980s devices, notably:
The chip could produce several different waveforms by locking the volume envelope generator to the frequency generator, and also had a noise generator with 3 pre-set frequencies which could also be locked to the frequency generator for greater range. Its outstanding feature was that it could output in fully independent stereo.
References
Philips SAA1099 Wikipedia(Text) CC BY-SA