The ROM-Expansion XXL is the big brother with twice the amount of samples than the regular ROM-Expansion and has so many sounds in it that your Fusion is like a completely new instrument. With 1.3 GBnew multisamples and 1400 Presets: The Fusion ROM-Expansion XXL. It is a multi-category sound library with a wide range of instruments. Pianos including the DynaGrand, Electric Pianos, Chromatic Percussions, Organs, Guitars, Bass, Choirs, Strings, Orchestrals, Brass, Reed, Ethnic Instruments, Woodwinds, really legendary Synths, SFX and more and with sophisticated and standardized Controller assignment.