InTime Tempo Tracking
software provides a flexible metronome that keeps time with your MIDI
performance. Play fluidly with legato, and InTime syncs to your
playing, for accurate transcriptions of real performances or to create
flexible backing tracks that follow you. Sounds nifty, if it works;
Windows users today got a 1.2 update while Mac OS X users got their
first Mac release.

Compatibility: Mac/PC
Cost: US$159