Caustic content pack. The Builderz Project for Caustic takes another step forward with Builderz Extreme. Full of grit and bite and in-your-face-madness. This expansion pack is filled with glitches, blips, noises of all types, pads, textures, atmospheres, risers, sinkers, booms and crashes, weird and strange noises and much much more, Builderz Style. What Will You Create?