Key Performer can be described as "the Swiss Army knife of the modern gigging keyboardist". It's a single software instrument which offers a wide variety of keyboard sounds that are always used in almost all musical genres where a keyboardist is involved. Just to summarize a few of its key features, it offers:

* Several classic keyboard sounds including pianos, electric pianos, synths, organs, etc.
* A sample playback section (aka "ROMpler") with "adaptive playback"
* A physical modeling classic Electric Piano
* A physical modeling "Wurly" piano
* A phase modulation synthesizer for the famous DX Piano
* A Virtual Analog polyphonic synthesizer
* A Virtual Tonewheel Organ with rotary speaker effect
* Two effect slots with all the most famous effects
* An AMP simulation section with overdrive
* A global Reverb effect
* 64 Programs per bank, 9 snapshots for organ sections and 9 for VA synth
* Full MIDI implementation
* Easy MIDI Learn
* Huge efficiency with very low CPU power requirements

* OSX 10.5+
* Intel CPU
* RAM 512 Mb
* Stereo soundcard with low latency ASIO support
* A MIDI interface or MIDI controller keyboard
* A VST or AU Host program for the plugin version