a sound-synthesis engine built into QuickTime itself (using a limited set of instrument sounds licensed from Roland), or any external MIDI-compatible hardware, thereby producing sounds using only small amounts of movie data. Following Bruce Leak's departure to Web TV, the leadership of the QuickTime team was taken over by Peter Hoddie. QuickTime 2.0 for Windows appeared in November 1994 under the leadership of Paul Charlton. As part of the development effort for cross-platform QuickTime, Charlton (as architect and technical lead), along with ace individual contributor Michael Kellner and a small highly effective team including Keith Gurganus, ported a subset of the Macintosh Toolbox to Intel and other platforms (notably, MIPS and SGI Unix variants) as the enabling infrastructure for the QuickTime Media Layer (QTML) which was first demonstrated at the Apple Worldwide Developers Conference (WWDC) in May 1996. The QTML later became the foundation for the Carbon API which allowed legacy Macintosh applications to run on the Darwin kernel in Mac OS X. The next versions, 2.1 and 2.5, reverted to the previous model of giving QuickTime away for free. They improved the music support and added sprite tracks which allowed the creation of complex animations with the addition of little more than the static sprite images to the size of the movie. QuickTime 2.5 also fully integrated QuickTime VR 2.0.1 into QuickTime as a QuickTime extension. On January 16, 1997, Apple released the QuickTime MPEG Extension (PPC only) as an add-on to QuickTime 2.5, which added software MPEG-1 playback capabilities to QuickTime. Lawsuit against San Francisco Canyon In 1994, Apple filed suit against software developer San Francisco Canyon for intellectual property infringement and breach of contract. Apple alleged that San Francisco Canyon had helped develop Video for Windows using several hundred lines of unlicensed QuickTime source code. They were contracted by Intel to help make Video for Windows better use system resources on Intel processors, which was subsequently unilaterally removed. Microsoft and Intel were added to the lawsuit in 1995. The suit ended in a settlement in 1997. QuickTime 3.x The release of QuickTime 3.0 for Mac OS on March 30, 1998 introduced the now-standard revenue model of releasing the software for free, but with additional features of the Apple-provided MoviePlayer application that end-users could only unlock by buying a QuickTime Pro license code. Since the "Pro" features were the same as the existing features in QuickTime 2.5, any