Quad is an open-architecture DVS (Digital Vinyl System) that can be used to play & scratch up to 4 MP3s simultaneously, controlled by 1 to 4 turntables. The turntables can be connected to any soundcard (ASIO driver required on PC); thanks to Quad's internal software Phono preamps it is even possible to connect the turntables to Line Inputs on the soundcard.

Features:

Open architecture:

• Compatible with any soundcard (Windows: ASIO driver required).
• Software RIAA Phono pre-amplification allows connecting turntables directly to Line Inputs on the soundcard.
• Nearly every parameter is MIDI controllable.
• Totally configurable audio routing.
• Easy MIDI Learn.
• Compatible with nearly all MIDI Controllers on the market (accepts CC & Note On/Off MIDI messages).
• MIDI feedback for endless rotary MIDI controllers or motorized fader MIDI controllers.
• Resizable and completely user-configurable GUI: Channels may be shown/hidden, EQ/Filter/asf. may be shown/hidden.

Total control:

• 1-4 decks may be used to control 1-4 tracks (MP3s/WAVs).
• Custom Vinyl Tracking algorithm provides a near-analog scratch experience.
• Perfect tempo-synchronization of up to 4 tracks using SYNC.
• Powerful 1-deck support (one single turntable may be used to mix up to 4 tracks).
• Virtual Zero Lock Range makes pitch 0 really 0 and virtually eliminates the "resting point" at pitch 0 on old turntables.
• Recording the mix as .WAV during mixing is possible.
• Keyboard shortcuts allow using Quad without touching the mouse.
• Preview Player for fast pre-listening of tracks on Headphones.

Advanced sound processing:

• Fresh sounding filters (X-Filter, SVF).
• 3-band Equalizers with parametric mids from 100Hz to 10kHz.
• Tempo-matched FX (Flanger, Phaser, Echo, Delay, LFO Filter, ...).
• Tempo-matched Loop Samplers.
• Any audio material (real Vinyl / CDs / Mic / ...) may be routed from the soundcard's inputs into Quad for mixing and FX-processing.
• Crossfader with 3 curves.
• Support for VST plugins (Windows only at the moment).
• Look-ahead limiters on each ASIO output avoid audible audio distortions when signal becomes too hot.

Managing your tunes:

• New, improved browser.
• ID3 Tags are editable.
• Create cases of your favourite tunes and music styles.

New in v2.20

• fixed: while re-scanning on user demand, quad could crash in very rare cases
• fixed: MIDI In would not work correctly if multiple MIDI Inputs were selected
• fixed: (OS X only) Quad would not play files with non-ASCII characters
• changed: no license file needed anymore to unlock Quad
• changed: instead of displaying a window to warn when loading a new song, a message is displayed in the Channel itself
• changed: instead of pressing "L" key, you have to press Enter key to load a song
• changed: instead of pressing SPACE key, you have to press F11 to tap. It works everywhere, also in Search Box.
• changed: instead of pressing "X" key, you have to press F10 to turn FX on/off. It works everywhere, also in Search Box.
• changed: better Level adjustment
• changed: major speed up in Browser's Treeview (OS X)
• changed: Backspace acts now the same as Del key in Browser
• changed: It is not possible to edit the metadata (tags) of songs while they're being played (except for WAV and AIFF).
• added: completely rewritten database and search function. Displays results while you're typing and always searches whole database. The new database can hold metadata for any kind of audio format.
• added: new EQ-type called "Isolator", inspired by some very good DJ mixer brand we won't name :)
• added: AU/VST support in FX section on OS X
• added: SYNC state of each Channel is now stored on exit of Quad and loaded back again when Quad restarts
• added: when SYNC button is off and the put on again, Quad "re-syncs" the Channel's tempo
• added: when a USB-drive/stick is put into the USB-port while running Quad, the Browser will be updated so the drive is listed
• added: in THRU mode, the waveforms and cuepoints disappear
• added: drag'n'drop from audio files into Quad2's Channels is now possible from: Explorer (Windows), Finder & iTunes (Mac)
• added: pressing key U on keyboard in the Browser unmarks loaded files and files put into cases (press U twice for complete unmark)
• added: pressing F1/F2/F3/F4 activates/deactivates Cue2 for Channel 1/2/3/4
• added: in Search Box, using UP/DOWN/ENTER may be used to navigate through the songs without leaving Search Box
• added: knobs are now greyed out when not used (when Filter X-Type is active, or EQ ISO-Type is active)
• added: "Invert Phase" option for inverting Phono input phase for being able to use cartridges Shure M-44 and Stanton 500-II