four top-quality virtual sound modules stage piano, poly synth, tone wheel organ, and GM modules use stand-alone or with a sequencer module and master effects processors compatible with most popular software details Key Rig from M-Audio covers all the basic needs for today’s keyboardist in a single virtual rack. Compatible with most Mac and PC environments, Key Rig delivers four great sounding modules that can be used in stand-alone or plug-in mode. The SP-1 Stage Piano module serves up grand pianos, Wurlitzer, classic electric pianos, FM and more. The MS-2 Polyphonic Synthesizer delivers a new, easy way to call up and edit great synth sounds. The MB-3 Tone Wheel Organ emulates the classic Hammond™ sound complete with rotary speaker. And the GM-4 General MIDI Module is great for sequencing the rest of your backing tracks. The master MIDI/Mixer section lets you route, split, layer and mix these four powerful modules in whatever way best suits your performance and recording needs. A master effects section even allows for adding a common effect in addition to the individual effect section included with each instrument.