This particular phrase combines two very distinct parts of the audio production world. On the one hand, is a very real, very powerful, and relatively new drum library from Toontrack, designed for aggressive, lo-fi, and vintage-sounding productions. On the other hand, "Sonore" is a well-known brand in high-end audiophile circles, famous for its ultra-premium music servers and streamers—a world quite removed from virtual instruments.
The extension is native to the architecture, allowing cross-compatibility with Toontrack's primary drum platforms. EZdrummer 3 Compatibility toontrack underground ezx extension sonore ezd full