Keith McMillen Instruments MIDI Expander

MIDI Over USB to Conventional 5-pin MIDI I/O Converter Intended for Use with Keith McMillen Instruments MIDI Controllers
Keith McMillen Instruments MIDI Expander image 1
Keith McMillen Instruments MIDI Expander image 1

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Keith McMillen Instruments MIDI Expander
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Connect Your KMI Gear to Your Hardware Synths!

Add MIDI I/O to your Keith McMillen Instruments controller with the MIDI Expander! The KMI MIDI Expander was created by Keith McMillen Instruments for the specific purpose of letting you hook your KMI SoftStep, 12 Step, QuNeo, or other control surface to your hardware synths and MIDI-equipped effects modules. The way it works is simple: you just attach your KMI controller to the MIDI Expander via standard USB. The MIDI Expander then converts the class-compliant MIDI data running to and from your controller via a pair of conventional 5-pin MIDI ports. That's it! Connecting your KMI gear to your hardware really is that easy with a Keith McMillen Instruments MIDI Expander!

Keith McMillen Instruments MIDI Expander USB/MIDI Bridge Features:
  • The ideal way to connect your KMI control surface to your MIDI-based hardware synths and effects
  • Simple, rugged, and easy-to-use converter between class-compliant MIDI over USB to conventional 5-pin MIDI I/O
  • True plug-and-play operation - hook it up and you're ready to go
  • Completely bus powered operation means no need for extra cables and bulky power supplies
  • No computer required for operation
  • LED indicators let you easily check power connectivity as well as MIDI in and out activity
  • Confirmed compatibility with SoftStep, 12 Step, QuNeo, and other KMI controllers
  • Dimensions: 4" x 1.25" x 1.25"
  • Weight: 2.5 oz.
Get more from your KMI gear with a McMillen Instruments' MIDI Expander from Sweetwater!

Additional Media

Control Surface Buying Guide
Synth Tricks: The Artistic Joy of Polyphonic Aftertouch

Tech Specs

Manufacturer Part Number K-701

Customer Reviews

Based on 6 reviews
Write your review

Super Easy Set Up

KMI gives simple instructions for setting this up. I got it running without reading them. It is really simple and functions invisibly. Of course, it should be part of the 12 Step and shouldn't have to be purchased separately. That said (grumpy old man) it works flawlessly.
Music background: Retired composer, producer, recording engineer now playing with art and sound

Another great piece of gear from Keith McMillan!

I needed the expander to convert some gear from USB to standard MIDI and this has been a great solution. The problem I have had is with some heavy Duty MIDI cables do not plug in. I ended up having to use lighter (smaller ended) cables. However, this does not affect performance. Overall, a nice small and affordable solution.
Music background: Live Playing, Home Recording

MIDI Expander

It's a great kit . Be aware that there is no two prong power cable included in case you need to use external power.

Finally! A way to use USB "MIDI" controllers without using a computer

The market is flooded with MIDI controllers that DO NOT HAVE MIDI OUT. Instead they have USB. That's great with computers, but not for the live performer who wants to control another device. I guess there must be a lot more home studios than live performers. For a long time I've been looking for a small MIDI controller I could bring onstage without having to setup a computer. The MIDI expander is the solution. I'm using it with the 12 Step. I suppose it should work with any USB MIDI controller... but I have not tried it.
Music background: Live Performer

Necessary Option

The Midi Expander greatly increases the usability to the very cool line of products from Dave McMillen Instruments. Providing a standard 5 Pin Din output allows all the DM controllers to work with all your hardware Midi devices. Trouble free. Plug and play.
Music background: Music Technology Specialist

Sweetwater Advice

Daniel Fisher

There are many reasons that make Sweetwater a great place to work. One fun reason is that you get to meet people who are as passionate and knowledgeable about gear and music as you are. And when you visit their basement, you get to play with lovingly maintained vintage equipment right alongside the latest technical innovations. For example, in one friend's basement, I got to experience how amazingly expressive the polyphonic aftertouch is on his late-'70s Yamaha CS-80 synthesizer. I could hold down a handful of keys and then open the filter on a single note just by pressing down on that key. Sadly, a used CS-80 goes for more than $10,000. Now, you can experience the artistic joy of polyphonic aftertouch with the QuNexus Smart Sensor keyboard controller. Along with velocity sensitivity, it can also send pitch bends from a dedicated pad, plus standard channel aftertouch, and so much more. If you've discovered the joy of analog synthesis, then you'll go crazy with the QuNexus's CV (control voltage) I/O and gate. The CV outputs can control pretty much any analog synth parameter that has a CV input, and the CV gate will trigger your envelopes. The CV outputs can often work on your guitar pedals that have an expression jack as well. The entire CV concept is so well thought out that you can even use the QuNexus as a MIDI-to-CV converter and a CV-to-MIDI converter! (Try to find either of those on eBay for less than this.) The unit is powered and lit by USB, making it a no-brainer to connect to your computer. The free QuNexus Editor software (Mac and PC) allows you to fine tune your performance in ways you probably haven't imagined. For example, imagine having a unique pitch bend for each note just by tilting each key forward and back. Or changing aftertouch to any continuous controller you want. You can even break free of the computer with the KMI MIDI Expander, which gives you a power supply as well as MIDI in/out jacks. Now don't get me wrong; I'm not saying that this is the perfect MIDI controller to play a Rachmaninoff piano concerto. It has 25 keys and octave -/+ buttons to cover all 128 notes of MIDI. What it is perfect for is giving you soul-satisfying expressive control over the notes you choose. There are so many more features found in the QuNexus that you'll have to call your Sweetwater Sales Engineer to learn more about this miraculous controller.
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See also: Keith McMillen Instruments, Keith McMillen Instruments Control Surface Accessories