DSP-Quattro is a powerful sound editor for Mac OS X that utilizes the latest technological advances of computer-based sound editing.

Main Features:

• Universal Binary support: DSP-Quattro runs natively on Macs based on new Intel processors.
• Full support of Mac OS X Quartz graphic libraries.
• Immediate Cut, Copy &Paste, and undos/redos, no matter how much is the audio file long.
• Batch Processor, for automated file format conversion, plug-ins and additional processing.
• State-of-art Linear Phase Sample Rate Converter (SRC) algorithm with selectable quality options, applicable also on the PlayList export, for AudioCD-ROM burning and for BatchProcessing.
• Extended Altivec support for extreme processing and file I/O speed.
• Fully programmable PlayList with real time and non-destructive internal and/or plug-in effects and crossfades between tracks.
• Built-in audio CDROM burning capability that conforms to the Redbook standards.
• Each PlayList track may have its own real time internal and/or plug-in effect chain.
• Playlist and audio CDROM image files can be exported or imported compatible with Roxio Toast/Jam format.
• AudioUnit Instruments and Effects plug-in support.
• AIFF, SDII and .WAV mono/stereo sound files direct load/save support: 8, 16, 24, 32 and 32-floats bit/sample (the last allowed only for WAVE and AIFF file formats).
• RAW data files Import/Export (8, 16, 24, 32 and 32-Floats bits/sample).
• Import, by using QuickTime, of most audio file formats, including MP3, audio tracks from QuickTime movies and Audio CDROMs, and more.
• Advanced HD based High Speed audio engine, to play any audio files forward and backward, at every speed, without loading them in RAM memory.
• Plays audio files at pitches ranging from 0 to x2, including a speed ribbon controller interface. Audio scrub mode with audio monitoring. Reverse playback supported as well.
• Full Project management, to Load/Save a snapshot of the current configuration and all settings, as, for example, opened files, loaded Instruments, plug-in instruments, I/O configurations, etc.
• Complete list of editing functions, most of which have a real time preview option for the best parameters setting.
• Very easy to configure to play multiple - also at the same time - virtual plug-in Instruments by MIDI, also for live performances.
• Innovative Recording options, to record multiple inputs and outputs on HD in real time, also while playing Plug-in Instruments by MIDI and/or audio files.
• Zooms and visual tools, the state of art in graphic visual interface for audio editing.
• Left or Right independent channel editing of stereo files.
• Generic and Edit Markers support, with floating window interface for their management.
• Regions are supported. DSP-Quattro offers also an advanced graphic control on the Marker&Region tool window and several related functions for their management.
• Regions list can be exported as AudioCD Image compatible with Roxio Toast/Jam format.
• Infinite levels of Undo/Redo.
• Complete Undo/Redo history table, to immediately jump back to any moment of the editing session.
• High quality built-in digital effects, applicable both as real time effects on audio insert, and as an off-line editing algorithm:
  - Chorus.
  - Digital Delay.
  - Dual Digital Delay.
  - Stereoizer.
  - MultiTap Delay.
  - Reverbs.
  - Resonant analog LowPass, HighPass, BandPass filter simulations.
  - BandReject filter.
  - 4 Bands full parametric EQ.
  - 7 Bands graphic mono and stereo EQ.

• BPM tempo based Auto-Detection, Auto-Loop and TimeStretching algorithms.
• Resampling, Pitch Conversion, Normalization, multiple Fade In/Out features.
  Drag&Drop support for fast loading, saving and exporting even regions of the audio files.

• Advanced floating window interface for Loop programming.
• X-Fade Looping algorithm fully programmable with real time preview.
• Multiple virtual Instruments and Effects hosting, for both real time live performances and off-line editing.
• Also Audio Inputs, Input Recorders, virtual Instruments can has their own independent insert effects.
• User can Save/Load/Copy/Paste the Insert and Global Effx chain, including all loaded plug-ins and their settings.
• Find Peak and RMS function with extended facilities.
• External audio devices fully supported, to address also multiple analog and digital inputs and outputs at the same time.
• Very easy to configure as Real time multi-effects unit, including Inputs to Outputs redirections.
• Full CoreMIDI drivers support.
• MIDI SAMPLE DUMP STANDARD (SDS) support.

Changes in v4.2.2

• Maintenance and bugfix release

Changes in v4.2.1

• Bugfix for a crash when editing a mono file with the pencil tool
• Bugfix for loading saved AudioCD layouts using the AudioCD layout file browser
• New PreRoll button on transport bars, and preroll default options on preferences
• Various other bugfixes

Changes in v4.0.5

• New Output Recorder GUI
• Improved compatibility.
• Various minor bugs have been fixed.

Changes in v4

• New commands and menus
• Improved Audio Editor
• AU cocoa GUI support and preset management
• External I/O device send/return internal plug-in module
• Improved Playlist
• Various bugfixes and new features, details here.

DSP-Quattro v3.5.2

• Compatibility with Mac OS X 10.7 Lion.
• Miscellaneous bugs have been fixed.