Mac users interested in Dsound gt player express generally download:
GT Player Express plays standard audio files like AAC, MP3 and WAV files. It allows guitar players to jam along with your favorite music at variable speeds.
It comes bundled with M-Audio's Fast Track USB interface, which provides a bridge between your guitar and your computer.
RT Player Express is a stand alone VST/VSTi host application which allows the use of VST plugins and VST instruments for realtime live performance.
RT Player Express can easily and quickly change a computer into an effect processor or synth/sampler station.