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Keith McMillen Instruments MIDI Expander Reviews

4.0 stars based on 6 customer reviews
Questions about the Keith McMillen Instruments MIDI Expander?

Questions about the Keith McMillen Instruments MIDI Expander?

Or call us at (800) 222-4700

  • Larry Ellingson
    from Spokane WA August 6, 2013Music Background:
    Retired composer, producer, recording engineer now playing with art and sound

    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.

  • Alex MacConnell
    from Des Moines, Iowa September 8, 2014Music Background:
    Live Playing, Home Recording

    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.

  • Customer
    from October 29, 2015

    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.

  • Paul Wisner
    from Arlington, MA February 15, 2014Music Background:
    Live Performer

    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.

  • Reek N. Havok
    from Huntington Beach, Calif October 24, 2012Music Background:
    Music Technology Specialist

    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.

  • Phitar
    from Woodbridge, VA February 3, 2016

    For KMI Use Only (sigh) ... but still handy.

    It's small, well built and does what it is supposed to do. I ordered this to use the QuNexus with a standard DIN in synth and for that it works GREAT.

    But I had hoped that it would also work with other usb midi equipment I have (based on the review by the guy who said "Finally!") and it won't. Tried it several non-KMI pieces of gear and most would power up but not transmit midi. Must block any non-KMI USB ID's.

    It DOES come with the AC adapter or you can power it with a computer USB or a powered hub.
    It could use some rubber feet or something to keep it in one place. Have mine Velcro mounted to my table right now.

    Now we just need someone to design a decent USB midi host that will work with usb class compliant controllers for under 100 bucks.


  • 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.

Questions about the Keith McMillen Instruments MIDI Expander?

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