Logic Pro is part of Apple's Logic Studio bundle of professional music applications and is a fully functional DAW software for recording, editing, and producing musical recordings.
The major new features included "Flex Time", Apple's take on "elastic" audio (a function which almost all competing audio applications had at this point). A version of the pedalboard from GarageBand is also included, together with a new virtual guitar amplifier where the modeled components could be combined in different ways.
There are also a number of improvements to audio editing, fulfilled user requests such as "bounce in place" and selective track and channel strip import, as well as an expanded content library including one more Jam Pack. Some of the bundled software, including MainStage 2 and Soundtrack Pro 3, was also improved. Logic Pro 9 is also the first version of Logic Pro that is not supported for use on PowerPC computers.