Steinberg - Groove Agent voices count 24bit 96mhz drum sounds MBs on HD 275 MB output 4 stereo out onboard patches 54 musical styles fx effects ambience limiter pros Each style includes 25 different patterns, excellent for quick rhythm cons funky top sliding menu, sliding can clear a pattern if linked other excellent midi out  ReFX - Nexus  voices count 24bit 96mhz 32poly MBs on HD 2.8GB filter types 6 to 24dB master filter onboard patches Over 650 presets, 4 Gigabytes fx effects built-in reverb, trance gate pros freely programmable appreciator cons   other custom skins, expandable packs Garritan - Personal Orchestra voices count 24bit 96mhz 32poly MBs on HD 1.8GB     fx effects reverb wet clone of dry as 2nd stereo channel pros Uses Native Instruments Kontakt Player cons CPU heavy onboard patches Stradivarius violin, Guarneri Violin, Gagliano Violin, Wurlitzer and Venus concert harps, Haynes flutes, Heckel bassoons, a Mustel celeste, a Rudolf von Beckerath concert pipe organ, a harpsichord   IK Multimedia - SampleMoog voices count 24bit 96mhz 16part multi timbre MBs on HD   onboard patches 16 sampled moog synthesizers fx effects 4 effects per part, chorus, flange, phase, distortion, Delay, Equalizer, 32 total pros bmp sync, 2 synth engines, over 50 controls cons   GMedia Music - MTron voices count 16 voices MBs on HD 5.18GB filter types none onboard patches Mellotron, and other classic timbers  fx effects Tone, Pitch, pros good quality tone cons limited editing other no other can compare Steinberg - Xphaze voices count 24 voices MBs on HD 350MB filter types adjustable cut off onboard patches over 100 comb patches fx effects multi selection section pros lots of different timbers cons CPU heavy other programmable phase Spectrasonics - Atmosphere voices count 24 voices MBs on HD 3.75GB filter types cut off onboard patches over 200 sampled sounds, Strings, Pads, Moods , EFX fx effects multi filter pros sounds can be made with a blend of two wave forms cons limited editing other 32Bit mode, octave shift Spectrasonics - Trilogy voices count 24 voices MBs on HD 3.03GB filter types cut off onboard patches Acoustic, Electric and Synth. 176 total wave forms fx effects multi filter pros good quality cabinet sound cons limited editing other 32Bit mode, octave shift