Run your lights
from the DJM-900SRT.

The setup you need.

Create your free account, build your lighting show, then download the Mac app to connect your rig.

• Your DJM-900SRT and a USB data cable for its Computer USB Type-B.
• A Mac running macOS 14 or later with the Very Lit app, your account and a saved lighting show.
• The manufacturer’s Mac audio driver or Setting Utility where required, compatible with your macOS version.
• An Art-Net-to-DMX node, a wired network connection from the Mac, and DMX cables to your fixtures. An Ethernet adapter may be needed on the Mac.

The SRT has its own driver and routing utility. A driver intended for the 900NXS or 900NXS2 is not a substitute.

Check this before the gig: this is a legacy device. Its documented USB route is usable only if your current Mac exposes the audio input. Confirm manufacturer driver and OS compatibility before installing software or relying on this route.

STEP 1 · MUSIC IN

Connect the computer audio port.

Connect the Computer USB Type-B to the Mac with a USB data cable. Keep the normal master/booth speaker wiring in place. Very Lit listens to a copy of the audio; your PA does not need to play through the laptop.

Open macOS Audio MIDI Setup and confirm DJM-900SRT appears with audio input channels. A playback-only output, storage device or MIDI connection is not enough. If the audio input is missing, check the model’s software, firmware, USB port and cable.

STEP 2 · ROUTE THE MIX

Send the program mix to the Mac.

Use DJM-900SRT Setting Utility → MIXER OUTPUT to send MIX(REC OUT). Keep any Serato DVS routing requirements in view while checking what every input pair sends.

The current bridge combines all input channels exposed by this device and has no stereo-pair picker for it. A recording mix on one pair does not silence the other pairs. Check them for pre-fader music, DVS tones, cue audio and microphone signals; use silent or appropriate mix routes where the manufacturer allows it.

If those other channels are needed by your DJ software and cannot be kept clean, send an available line-level program output to a separate stereo USB audio interface. Select that interface in Very Lit to isolate the lighting feed.

STEP 3 · LISTEN IN VERY LIT

Select the USB input.

Open Audio input in the Very Lit Mac app and select DJM-900SRT. Allow macOS microphone permission if requested; it also covers external audio capture. Choose your saved show and watch the audio response while the music plays.

After a USB disconnect, check the selected input again. A microphone fallback can receive crowd sound instead of the direct mix.

STEP 4 · LIGHTING OUT

Connect the Art-Net node and fixtures.

Connect the Mac and Art-Net-to-DMX node to the same reachable wired network. In Very Lit’s Connections panel, enable Art-Net and set the destination host to the node’s address. Allow macOS Local Network access when requested.

Map your show universe to the Art-Net universe configured on the node’s DMX port. Run DMX OUT from that node to the first light’s DMX IN, then continue the fixture chain. Match each fixture’s model, channel mode and start address to the show’s patch.

Test one light with Manual Control first. Then release manual overrides, check Blackout is off and run the music-reactive show.

STEP 5 · PROVE THE FEED

Test what the lights actually hear.

1. Play a track through the mixer. Check the Mac audio response and a physical light.
2. Cue a second track with its channel fader down. If the audio analysis changes, an unwanted pre-fader or cue route is being captured.
3. Stop the music, then speak or clap beside the Mac. The USB input should not respond to that room sound.
4. If you use a mixer microphone, test it separately. USB avoids the laptop microphone; it does not remove speech already routed into the USB feed.
5. Reconnect the cable and repeat the input and one-light checks before opening the doors.

Useful answers before your set.