How to Use Two Laptops to DJ With at the Same Time

Written by matt gerrard
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How to Use Two Laptops to DJ With at the Same Time
Using a PC as your input device doesn't change the basic skills of DJing; mixer functions will be just the same. (DJ en action image by Jerome Dancette from

Using PCs or Macs to mix music is not a new development. Over the past decade, since January 2011, digital DJs have steadily caught up on the traditionalists in numbers. It's now just as likely to see a rack-mounted PC in the DJ booth as it is to see a pair of turntables. One of the advantages that computer-based DJing provides us is the ability to keep adding more virtual turntables to our setups. By synchronising a pair of laptops, it's possible to run identical DJ software on each, doubling the amount of songs, samples and effects you can have playing at any one time.

Skill level:

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Things you need

  • 2 laptops, each with identical DJ application installed
  • 2-channel audio interface with headphone output
  • Ethernet cable
  • Ethernet sync software such as MIDI over LAN

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  1. 1

    Connect the two laptops together using the Ethernet cable. Connect the audio outputs of each interface to the channel inputs on your mixer. Try playing music from both machines at once, and panning between them using the cross-fader. Set the volume levels from each to be similar, and adjust the mixer output level to a comfortable volume.

  2. 2

    Connect headphones to the socket on the audio interface, and try using the output select controls to listen the different sources. Depending on which DJ software you are using, this may be done by a switch, or a blend dial. You won't be able to switch between sound from both laptops yet, just between the two virtual turntables on each machine.

  3. 3

    Access the "Preferences" menu on your "Channel 1" laptop and locate the "MIDI Options" section. Enable "MIDI Clock Send" and select your Ethernet cable as the route. This will cause your first laptop to send a signal of its internal clock pulses to the second laptop, allowing them to synchronise with each other.

  4. 4

    Access the "Preferences" menu on your "Channel 2" laptop and enable "MIDI Clock Receive" --- it may be referred to as "Slave Mode" depending on which software package you are using.

  5. 5

    Play a song on the first laptop, then attempt to use the a tempo-synced effect on the second laptop; they should both match up with the beat. If there is any delay with the timing, access the "preferences" again and adjust the "MIDI Clock Offset" control until the signals match up.

Tips and warnings

  • It's not too important which laptop is the slave and which is the master, but if one has a significantly higher specification: More RAM, a faster processor or more disk space, set that one as the master, and you'll be less likely to experience any software errors as a result of a lack of system resources.

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