VirtualDJ - Hardware List - By feature : 4-channel mixer
VirtualDJ - TCmania 4 Decks
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VirtualDJ - Hardware - Numark
Amazon.com: LyxJam 2-Deck Portable DJ Controller, Mixing Console with LCD Display | Manual Looping, USB, MIC Input, Record Output, 16 Performance Pads with Virtual DJ LE Software Included (Download) : Musical Instruments
PRO Virtual DJ Sound Mixer:Amazon.com:Appstore for Android
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VirtualDJ - The #1 Most Popular DJ Software
VirtualDJ - Hardware
VirtualDJ - User Manual - Interface - Top Section - Application Controls - Layout
VirtualDJ - Hardware
Virtual DJ 7 Trumps 4 Decks with, erm, 99 - Digital DJ Tips
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VirtualDJ - Hardware - Numark Mixtrack Platinum FX
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MIXO: VirtualDJ Overview
VirtualDJ - Hardware
VirtualDJ - Hardware List - By feature : 4-deck deck
VirtualDJ - Hardware
VirtualDJ - Hardware List - By feature : 4-channel mixer
HOW TO INSTALL VIRTUAL DJ 8 WITH 4 DECKS - YouTube