A professional audio/midi sequencer that's also easy to understand. With a great user interface, support for VST effects and synths, low-latency ASIO and DirectSound playback up to 32-bit 96KHz, ReWire 2.0, lots of built-in effects including a sampler, pitch-shifter, EQ, reverb; unlimited tracks + freedom to mix sample rates and time-stretch audio, powerful project management features and archiving using FLAC and Ogg-Vorbis compression, integrated CD-ripper, and much more.