== SID Internal Architecture ==
From an interview in August 1996 with Bob Yannes, the designer of the SID chip. [https://webtrondal.archive.orgcom/webc64sid/20090605222305/https://www.joogn.de/sid.yannes.html Source]
It's pretty brute-force, I didn't have time to be elegant. Each "voice" consisted of an Oscillator, a Waveform Generator, a Waveform Selector, a Waveform D/A converter, a Multiplying D/A converter for amplitude control and an Envelope Generator for modulation. The analog output of each voice could be sent through a Multimode Analog Filter or bypass the filter and a final Multiplying D/A converter provided overall manual volume control.