The PRO DJ LINK stem engine ●
PRO DJ LINK and stems.
Finally on the same rig.
A preconfigured stem engine that runs pre-extracted stems locked sample-accurately to your CDJ-3000X, without ever taking PRO DJ LINK offline. Stacked waveforms intact. Beat sync intact. Vocals and instrumentals, finally, on the same rig.
Full refund any time before your unit ships. No risk while you wait.
Stock Pioneer software splits your rig into two mutually-exclusive modes. You get everything on one side or stems on the other, never both. The CDJ-3000X (Sept 2025) doesn't combine native stems with this mode either. As of this writing, no shipping firmware merges the two.
CDJs play their own audio from a Rekordbox-exported USB. Rekordbox software is offline.
Rekordbox is the audio engine. CDJs drop to HID controllers. Audio is Mac → DJM USB.
Pioneer makes you choose.
● CHURRDJ doesn't.
CHURRDJ keeps your CDJs in Export mode (PRO DJ LINK stays online) and parallel-plays pre-extracted stems from a dedicated sidecar unit, routed through additional mixer channels. The unit locks to the CDJs over the LAN, keeping its stem cursor matched to whichever deck is playing.
< 1 ms drift
A sub-sample sync loop keeps each stem locked to its CDJ's pitch fader in real time. Move the slider; the stem follows.
1 swap per track-load
Load a new track on a CDJ and the unit reads the metadata, looks it up in your stem index, and swaps the channel's playing stem cleanly, mid-set.
Zero install
The engine serves a token-gated control page. Open it on any phone or laptop on the LAN (or remotely over a secure mesh VPN) to toggle vocals/instrumental and record the master mix.
CHURRDJ is built for Pioneer booth gear and validated on the reference rig below. Stem playback runs across the Pioneer USB-DJM family. Master recording supports that same family, but the DJM-A9 is the only mixer we've tested on hardware so far, so recording on the others is experimental for now.
Source units running PRO DJ LINK
Any DJM with USB audio output
Tested on the DJM-A9; other Pioneer DJMs experimental
As of this writing, CHURRDJ is the only way to run real-time stems on a Pioneer or AlphaTheta CDJ rig without taking PRO DJ LINK offline. Rekordbox keeps stems and the link mutually exclusive, and no shipping firmware merges them.
It is not a tech demo. CHURRDJ has run on real Pioneer rigs, on real gigs, and working DJs tuned the setup and the live UX in the booth. Every unit is bench-tested against a live CDJ and DJM before it ships.
CHURRDJ has been proven on real Pioneer rigs, on real gigs — working DJs ran it in the booth and told us exactly what to tighten in the setup flow and the live UX. It's dialed in, and now it's available as a finished product.
CHURRDJ now ships as a preconfigured, ready-to-go unit — assembled, imaged, and bench-tested against a live CDJ + DJM rig before it leaves San Jose. Plug it into the booth and the stems are already there. Pre-order yours now.
$399 · Preconfigured, ready-to-go unit.
Built to order in San Jose and bench-tested before it ships. Ships worldwide — shipping calculated at checkout. Secure your unit now.
Drop your email and we will let you know when the next CHURRDJ batch opens, plus the occasional build update. No spam, unsubscribe any time.
Rekordbox doesn't expose a stems extension point, and the architectural problem isn't "can stems run" but "can stems run while PRO DJ LINK stays alive." Stock Rekordbox makes those modes mutually exclusive. CHURRDJ sidesteps the whole conflict by running stems on a separate audio device (the CHURRDJ unit → DJM USB) while the CDJs stay in Export mode untouched. There's no way to do that inside Rekordbox.
Stem playback is designed to work with Pioneer DJMs that have a USB audio output: the V10, 900NXS2, 750MK2, and 450. Master recording now supports that same Pioneer DJM family, but the DJM-A9 is the only mixer we've tested on hardware, so recording on the others is experimental for now. We confirm compatibility with the rig you list when you order. Non-Pioneer mixers are not supported.
It's a low-profile unit, 140 × 90 × 28 mm, that sits in the booth next to your mixer and disappears. One ethernet run into PRO DJ LINK, two leads to spare mixer channels, and USB-C power, that's the whole install.
$399 plus shipping for the complete, preconfigured unit: the sealed engine, a backup system card, the full cable kit, a spec-matched power supply, the quick-start card, and lifetime signed firmware updates. Built to order in San Jose. US shipping is $20, international $50, calculated at checkout. Import duties and VAT on international orders are the buyer's responsibility. $399 is the pre-order price through Jul 5; after that it goes to $499.
Pre-orders are estimated to ship by late July 2026. Each unit is assembled, imaged, and bench-tested before it leaves the bench. Every unit carries a 30-day rig guarantee: if it won't run on your supported Pioneer setup, you get a full refund.
You don't run anything by hand. Drag a track onto the CHURRDJ Ingest Mac app and it does the rest: it splits the song into vocals and instrumental (on-device, Apple Silicon recommended), matches it to your library, and ships the stems to your booth automatically. Add tracks any time; they process in the background. The Mac app is a free companion download for owners.
Yes, the engine looks up tracks by Rekordbox metadata broadcast over PRO DJ LINK. Source audio files have to exist on disk (no Tidal/streaming-only tracks). Indexing is automatic: the Mac app rebuilds the lookup whenever you add music, so newly added tracks just work.
No. The unit runs fully offline once stems are loaded and the engine is configured. Internet is only useful for remote phone control over a secure mesh VPN, which lets you reach the unit from your phone even when the venue Wi-Fi blocks client-to-client traffic. Offline-only setups work; you just have to be on the same LAN as the unit to load the control page.
Probably, the PRO DJ LINK protocol has been stable since the CDJ-2000NXS2 generation. Our sidecar reads PRO DJ LINK directly and has been updated specifically for the CDJ-3000X. If a firmware update breaks something, we treat it as a priority and get a signed patch out to every unit quickly.
Yes. The engine captures the master out over USB and writes a 24-bit stereo WAV to a folder you choose. The DJM-A9 is fully tested; recording on the other Pioneer DJMs (V10, 900NXS2, 750MK2, 450) is supported but still experimental, so tell us how it goes. Press Record in the web UI to start. It is off by default and writes about 0.9 GB per hour, so leave room on the unit's storage.
Fair question for any pre-order. CHURRDJ is built to order by one person in San Jose, and you pay up front to reserve your unit and its parts. Because nothing has shipped yet, you can get a full refund any time before your unit ships, just email us before it leaves the bench. After it lands, the 30-day rig guarantee covers you if it won't run on your supported Pioneer setup. And the product is real: it has run on real CDJ-3000X and DJM-A9 rigs, in real booths.
Because the cheap options all need a laptop, and on CDJs they make you give something up. Serato can do stems on CDJs, but turning stems on sacrifices your hot cues, and you are back to carrying and trusting a laptop in the booth. CHURRDJ is a self-contained appliance: real-time stems on two spare mixer channels, locked to your CDJ, with PRO DJ LINK and your hot cues left untouched, and no laptop. The $399 is the complete unit, assembled and bench-tested per order, not a subscription.
As of this writing, for a Pioneer or AlphaTheta CDJ rig that has to stay on PRO DJ LINK, yes. Rekordbox makes stems and PRO DJ LINK mutually exclusive, and no shipping firmware merges them. CHURRDJ runs stems on a separate audio path so your decks stay in Export mode, untouched. If Pioneer ships native stems-with-link someday, great. Until then, this is how you get it.
Something not covered here? Write to beta@churrdj.com, we'll add your question to the next pass.