Logic Pro X has been designed with a modern new look while preserving and expanding the power and features that professional users rely on. The streamlined interface provides access to advanced tools and functionality for more technical tasks, or can be hidden to allow musicians to focus on being creative. Flex Pitch helps users fix out-of-tune vocals and even change the melodies of recorded audio by manipulating individual notes within an audio waveform. Track Stacks lets you organize and collapse multiple tracks into one, or can be used to create rich, layered instruments. Smart Controls allow you to manipulate multiple plug-ins and parameters with a single move for quick and powerful sound design. An improved Mixer helps manage mix sessions more efficiently, with increased visibility into signal flow and dynamics and faster ways to manipulate channel inserts. Logic Pro X provides a collection of new creative tools for songwriting and music production. Drummer delivers professionally produced, realistic drum tracks that respond to your direction and can perform millions of unique grooves in rock, alternative, songwriter and R&B genres. Drummer is powered by the performances and sounds of some of the industry's top session players and recording engineers, including legendary mixer/producer Bob Clearmountain, who has worked with the Rolling Stones, Bruce Springsteen and David Bowie. Designed to work with Drummer, the new Drum Kit Designer plug-in lets you build your own custom kit using a diverse collection of professionally recorded snare drums, toms, hi-hats and cymbals that you can mix, match and fine tune to get the right drum sound for your song. Logic Pro X expands Logic Pro's rich collection of synthesizers and keyboards with more new instruments. The Arpeggiator is one of nine new MIDI plug-ins and can transform a simple keyboard chord into an elaborate performance. The new Retro Synth emulates some of the most popular classic synthesizer tones from the 70s and 80s, and Vintage Keyboards offer realistic models of electric pianos, B3 organs and clavs, with sophisticated tone-shaping controls. Bass Amp Designer allows bass players to play and record using vintage and modern bass amps, with cabinets and microphones that can be configured to build a custom bass rig. Logic Pro X also features an entirely new Sound Library with an updated loop collection and over 1,500 instrument and effect Patches that make creative use of Track Stacks, Smart Controls, the Arpeggiator and other new plug-ins.