Keith McMillen Instruments QuNexus Red

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Keith McMillen Instruments QuNexus Red


Description & Specs

Condition Note: Minor cosmetic blemishes, missing usb c cable, there is a faint light that comes through two of the keys that can be seen in very dark environments, but it does not affect the functionality.

QuNexus is a powerful MPE keyboard controller and three track arpeggiator/step sequencer. Its 25 touch-sensitive keys detect velocity, polyphonic aftertouch, and per-key tilt, giving you unprecedented control and musical expression. Each of the three arpeggiator/sequencer tracks can be programmed with up to 32 steps, 10 selectable arpeggiator patterns, and can be independently assigned to USB, MIDI, and Eurorack outputs. Blue and white LEDs illuminate the keys during arpeggiations, step sequences, and playback.

QuNexus can control MIDI hardware using the included MIDI Out cable or our optional MIDI Expander (sold separately). You can connect to modular synthesizers via the gate, three CV outputs, and two CV inputs, all of which can be assigned using the QuNexus editor which is compatible with Windows and MacOS.

A three track step sequencer and arpeggiator to create, jam, and compose music on the fly with.

QuNexus connects to USB, MIDI, and Eurorack devices. And with three assignable tracks, you can quickly switch between multiple devices.

MIDI Polyphonic Expression (MPE)
Each of the 25 keys detects pitch, velocity, slide (y position), and pressure.

25 Key MPE Keyboard Controller

  • Touch-sensitive keys detect velocity, polyphonic aftertouch, and per-key tilt
  • New key and pitch bend algorithm based on our K-Board Pro 4 gives superior playing and expression
  • User selectable and customizable velocity/expression curves and per-key sensitivity adjustment

Three Track Sequencer and Arpeggiator

  • Track are switchable between arpeggiator or step sequencer mode
  • Up to 32 quantized steps per pattern, 8 pattern slots to save and recall patterns
  • Playback divisions from whole notes to 32nd notes, dotted or triplets, 5-255bpm
  • Arpeggiator supports 10 playback modes, including pendulum, random, and brownian motion
  • Each track is independently assignable to MIDI channels, USB/DIN and CV outputs
  • Track 1 supports MPE playback with each key transmitting aftertouch and tilt


  • USB MIDI with three ports (keyboard, expander, and CV)
  • MIDI DIN out using the included KMI MIDI Out Adapter Cable
  • MIDI DIN in and out using the optional KMI MIDI Expander (sold separately)
  • 1 Gate output, 3 CV output, and 2 CV inputs (using 1/8″ stereo trs connectors)

Control Layer and Programming

  • Separate control layer lets you map each key to its own notes and/or CCs
  • Standalone editing and saving of most common parameters
  • Advanced configuration using the QuNexus Editor
  • Compatible with MacOS and Windows

You read that right! Any orders over $75 ship for free!*

The CME Difference:  CME's mission is to make sure your shipment will arrive quickly, carefully, and correctly. We realize that the online ordering of guitars and instruments, in general, can be a nerve-racking experience. We are here to put your mind at ease and make your transaction smooth and enjoyable! As musicians ourselves, we want to make sure everything gets to you the way it should, every time.

Most orders ship the same or next day:  
We greatly appreciate your patience, and are working hard to fulfill all requests as quickly as possible, while practicing recommended safety guidelines.

Our Bottom line: We care! This is something we take very seriously, because it's what you deserve. Our shipping, sales, and customer service teams are always striving to create the best experience for you. If you have any questions, comments, or concerns, we want to know.

Please don't hesitate to reach out to, or call us directly at 773-525-7773.

*Special exceptions do apply.



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3316 N Lincoln Avenue Chicago, IL 60657

We're right off the CTA Brown Line 'Paulina' Stop Just North of Belmont and just West of Ashland.

We’re all musicians here at Chicago Music Exchange and we want you to love the gear you get from us. We understand that sometimes you get a piece of gear that doesn’t work out for you. That’s why we offer an easy return policy to take the stress out of purchasing from us.

If you decide you'd like to return an item, please contact your Sales Rep, chat us, or give us a call.

If you placed your order on Amazon or eBay, we advise issuing the return request from your account on the platform of purchase - our Customer Service team will process a refund upon receipt of the item(s).

Most new items may be returned within 30 days of delivery and most vintage & used items may be returned within 3 days of delivery for a full refund, exchange, or store credit. Please pack the product safely for the journey back to us. If the product was shipped for free, the charge will be deducted from refund, unless the reason for the return is outside normal circumstances.

Please contact us as soon as possible if your order was received incorrectly, damaged, or defective. Most times we will give you an RA number (Return Authorization). Why is that number important? This will allow us to speed up the process of the return.

We reserve the right to charge a restocking fee based on the return condition. Some items we just can’t take back for returns, due to a one time function like strings or drums heads and other times it’s not sanitary to do so with microphones or harmonicas. If you aren’t sure if what you bought falls into a category like this, call us (773) 525-7773!

We strive to get your return processed quickly. Most of the time we have it done within two business days. Funds going back to credit cards usually takes two to four business days. CME strives to make sure all customers are happy with their experience. It is our priority to provide great service along with great gear. We always want to be helpful, and open to your feedback. Please let us know your thoughts! If you have any questions, we’re here for you!

Feel free to email us at or give us a call at (773) 525-7773.