In the golden era of plugin development, there were giants, and then there was . Known today for the behemoth that is Nexus, old-school digital audio workstation (DAW) users remember a different time—a time of gritty oscillators, SID chip emulation, and a festive, elusive software update known simply as reFX quadraSID AU VSTi 1.6.2 MERRY XMAS .

Why was this plugin so desired? In the late 1990s and early 2000s, electronic music was obsessed with the future (trance supersaws) and the past (electro-funk). Artists like 8bit Weapon and games like Cave Story sparked a chiptune revival. Producers wanted the authentic "lead" sound from Commando or the bass from The Last Ninja . While hardware SID chips were rare and required soldering, quadraSID offered algorithmic modeling of the SID’s infamous analog filter (the 6581’s "gate" distortion) without the noise floor. Version 1.6.2 specifically would have included bug fixes for filter resonance and envelope accuracy, making it a staple for retrowave producers.

Given that reFX has moved on to Nexus 4 and no longer sells quadraSID (it is considered abandonware), acquiring version 1.6.2 requires some digital archaeology.