Spectrasonics Trilian - bass instrument software with large core library, including multiple new acoustic, electric & synth basses, enhanced versions of all the original Trilogy patches, based on powerful STEAM engine technology, arpeggiator with groove lock, integrated FX racks, including all effects from Omnisphere, 8-part multi-timbral, expressive multi-sampled dynamic slides, stack mode, edit page, 64bit native support. Compatible with Windows Vista/7/8 and MAC OSX 7 or higher, VST/AU/RTAS, AAX