Metro for Mac

From Sagan Technology:

Metro is a fast-operating, easy-to-learn high-powered sequencer for the design of professional audio projects. It stands alone as a complete and integrated MIDI, audio and video production system.

The audio system supports up to 64 audio tracks. Each track can have its own effect chain. Eight aux busses are also supported. Each with their own chain. Chains can be made up of VST effects and/or AudioUnits (OS X only). VST 2.0 is supported. All effects can be automated. Real-time editing is encouraged. Software audio play-thru allows the original audio to be recorded regardless of what plug-ins are currently in use.

The MIDI system has been around since the 1980's and is the most versatile and stable product of its kind on any platform. Metro combines all the functionality expected from a professional macintosh MIDI sequencer with a simplified interface and innovative ideas, such as the Rhythm Explorer and the algorithmic Note Spray Paint tool.This MIDI system has been updated to support CoreMIDI and VST technologies.

The video system uses Apple's QuickTime technology for recording, applying video effects and overlaying text.