It is iconic in specific music circles. It was famously used by ZUN for early Touhou Project soundtracks and remains a staple for modern Amapiano producers due to its distinct, "punchy" acoustic presets.
hosts an "Edirol Plugin Collection" that includes the Super Quartet, noting it is in a "licensing gray area" because the original sources and current license status are unknown. Modern Alternatives:
Reviewers from Musician's Friend note that while limited to four categories, the instruments sound more realistic than general MIDI canvases once tweaked. Free Download & Compatibility Issues Edirol Super Quartet Vst Exploring The Synth
While the Edirol Super Quartet was a legendary plugin, pursuing a "free download" is not recommended due to legal issues, security risks, and technical obsolescence (32-bit incompatibility).
(E. Pianos) + DB-33 (Organ) + Mini D