DIY Compact Mixer

KORG has announced the NTS-4, a compact analogue performance mixer kit designed for hardware setups built around the volca series, NTS instruments, Eurorack modular gear and desktop synths.

The NTS-4 is the fourth edition in the Nu:Tekt series. Like those before it, NTS-4 requires self-assembly that only takes minutes. What you end up with is a six-channel, palm-sized desktop mixer built for extended use in the studio, on stage or on-the-go.

Every channel has its own CUE and MUTE buttons. CUE routes the channel privately to headphones before it goes into the live main mix; useful for monitoring in a live set and for transitions that need to be set up without the room hearing it. MUTE cuts the channel instantly. Together CUE and MUTE are controls that make NTS-4 feel like a performance mixer rather than a routing box.

Six channels: four stereo minijack inputs and two mono minijack inputs compatible with Eurorack-level signals. An internal attenuator on the mono inputs switches between line and Eurorack level, making it a direct integration point for modular rigs without additional hardware. Dedicated stereo SEND and RETURN connections handles external effects. MAIN L/R outputs use standard unbalanced ¼” jacks. Capable of processing up to 10 audio signals, NTS-4 can work as the center of your hybrid hardware setup.

Each channel has a SEND FX control with seven built-in effect options: delay, ping pong delay, two hall reverbs, two slap reverbs and chorus. The MAIN output runs a TOTAL FX engine with ten options: low-pass filter, high-pass filter, isolator, flanger, phaser, decimator, drive, distortion, compressor and limiter. Two independent stereo effect engines running simultaneously; SEND FX for spatial depth per channel and TOTAL FX to shape the full mix. USB-C can handle both power and audio. 48kHz, 24-bit to a Mac, PC or mobile device. Record a performance directly to a phone. Stream a live set. Route MIDI from a DAW through the dedicated MIDI OUT jack to hardware.

Specifications

Channels: 4 stereo (3.5mm stereo minijack) + 2 mono (3.5mm mono minijack, Eurorack-compatible with switchable attenuator)

Inputs: Stereo 1–4, Mono 1–2, Return (3.5mm stereo minijack)

Outputs: Main L/R (1/4″ mono phone jack, unbalanced); Headphone (3.5mm stereo minijack); Send (3.5mm stereo minijack)

Send FX (per channel): Delay, Ping Pong Delay, Hall Reverb A/B, Slap Reverb A/B, Chorus

Total FX (master): LPF, HPF, Isolator, Flanger, Phaser, Decimator, Drive, Distortion, Compressor, Limiter

Performance controls: CUE and MUTE on every channel

USB-C: 48 kHz / 24-bit audio; USB MIDI; bus power support

MIDI Out: 3.5mm TRS minijack

Display: 3-digit 7-segment LED

Power: USB bus power or AC adapter (DC 9V, sold separately)

Dimensions: 195 x 125 x 38 mm (7.68″ x 4.92″ x 1.50″)

Weight: 613 g (1.35 lb)

Included: USB Type-C to Type-A cable; assembly instructions

Accessory (sold separately): AC adapter (DC 9 V)

Chassis: Steel

Availability

The KORG NTS-4 Performance Mixer Kit will be available beginning July 10, 2026, through official KORG retailers