An application to trigger MIDI events when CDJs start playing tracks, reach particular beats, or whatever else you can think of. Built using beat-link. There is more description and a video in a DJ TechTools article, too!
Download the latest disk image (
.dmg) installer for the Mac,
installer for 64-bit Windows, or executable
.jar file for other
platforms, from the
page and double-click it to run it. If that doesn’t work, see
A trigger window will open, in which you can choose the players you want to watch, the kind of MIDI message to send when they start and stop, and when the triggers are enabled:
There is also an
for monitoring the status of each player found on the network, which
you can access by choosing
Show Player Status in the
And starting with version 0.5.0, there is a Show interface with which you can paint cues on track beat grids, to automate away the complexities of manually managing triggers.
This page is just a quick introduction! Please see the the full
- How to configure Triggers
- How to use Expressions
- Working with title/artist metadata
- Working with Ableton Link
- Integration examples
And much more... and hopefully you will soon be coming up with interesting integration projects of your own.
You can also find user-contributed examples and resources on the project Wiki. Once you have come up with your own great ways to use Beat Link Trigger, please add a page or two the Wiki to share them with others!
First of all, we would love to hear from you! We have no way of knowing who has discovered, explored, downloaded and tried Beat Link Trigger. So if you have, please write a quick note on the Gitter chat room to let us know! Even if it is only to explain why it didn’t quite work for you.
If you run into specific problems or have ideas of ways Beat Link Trigger could be better, you can also open an Issue.
And if you think you've come up with new or better way to do something, terrific! Please take a look at our guidelines for contributing and we can't wait to hear from you!
Please be mindful of our Code of Conduct to make sure everyone feels welcome in the community.
Beat Link Trigger is, and will remain, completely free and open-source. If it has helped you, taught you something, or pleased you, let us know and share some of your discoveries and code as described above. If you’d like to financially support its ongoing development, you are welcome (but by no means obligated) to donate to offset the hundreds of hours of research, development, and writing that have already been invested. Or perhaps to facilitate future efforts, tools, toys, and time to explore.
If enough people jump on board, we may even be able to get a newer CDJ to experiment with, although that’s an unlikely stretch goal.
This is in no way a sanctioned implementation of the protocols. It should be clear, but:
⚠️Use at your own risk! For example, there are reports that the XDJ-RX crashes when BLT starts, so don’t use it with one on your network. As Pioneer themselves explain, the XDJ-RX does not actually implement the protocol:
“The LINK on the RX is ONLY for linking to rekordbox on your computer or a router with WiFi to connect rekordbox mobile. It can not exchange LINK data with other CDJs or DJMs.”
While these techniques appear to work for us so far, there are many gaps in our knowledge, and things could change at any time with new releases of hardware or even firmware updates from Pioneer.
You should also not expect to be able to run Beat Link Trigger, or any project like it, on the same machine that you are running rekordbox, because they will compete over access to network ports.
Beat Link Trigger seems to work great with CDJ-2000 Nexus gear, and works fairly well (with less information available) with older CDJ-2000s. It has also been reported to work with XDJ-1000 gear. If you can try it with anything else, please let us know what you learn in the Gitter chat room, or if you have worked out actionable details about something that could be improved, open an Issue or submit a pull request so we can all improve our understanding together.
If something isn’t working with your hardware and you don’t yet know the details why, but are willing to learn a little and help figure it out, look at the dysentery project, which is where we are organizing the research tools and results which made programs like Beat Link Trigger possible.
If you downloaded the
.jar version and
double-clicking doesn’t open up the application, make sure
you have a recent Java SE runtime
installed, and try running it from the command line:
java -jar beat-link-trigger.jar
If that does not work, at least you will be able to see a detailed report of what went wrong, which can help you troubleshoot the issue.
If you see a long exception stack trace similar to the one in this discussion and you have your computer language set to one that uses an alphabet which is substantially different from English, you may be encountering what seems to be a bug in the GUI library (or maybe even in Java itself). Try setting your system language to US English, and see if that at least lets you run the program.
Mac Trust Confirmation
If you are on a Mac, your best option nowadays is to download the disk image installer. It contains Beat Link Trigger packaged as a native Mac application, with an embedded Java 11 runtime, so you don’t need to worry about installing or managing Java if you don’t use it for other purposes. It is code-signed by Deep Symmetry, so your Mac should be happy to install and run it without complaint.
If you already have your own Java runtime installed and want to use
it, you can instead download the smaller executable
.jar file, but
then the first time you try to launch the downloaded
jar file by double-clicking it you will see an error like this because
it is not a Mac-specific application:
You can fix that by control-clicking on the Jar and choosing “Open” at the top of the contextual menu that pops up. You will be asked to confirm that you really want to run it. Click the “Open” button in that confirmation dialog, and from then on, you will be able to run that copy by just double-clicking it.
You will need to repeat this process for each version that you download.
Copyright © 2016–2019 Deep Symmetry, LLC
Distributed under the Eclipse Public License 1.0, the same as Clojure. By using this software in any fashion, you are agreeing to be bound by the terms of this license. You must not remove this notice, or any other, from this software.