Logic Pro is a hybrid 32 / 64 bit digital audio workstation and MIDI sequencer software application for the Mac OS X platform.
Logic Pro provides software instruments, synthesizers, audio effects and recording facilities for music synthesis.
Recent versions of Logic only support Apple's AU format for plugins. VST plugins cannot be used by Logic without using an AU wrapper.
Logic Pro can work with MIDI keyboards and control surfaces for input and processing, and for MIDI output.
It features real-time scoring in musical notation, supporting guitar tablature, chord abbreviations and drum notation.
- source: Wikipedia