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Keith McMillen Instruments

Keith McMillen Instruments resides at the forefront of expressive MIDI controller design. KMI’s unique controllers and affordable MIDI solutions bring cutting-edge technology to your music. As early pioneers of MIDI Polyphonic Expression (MPE), KMI is on a mission to turn every gesture into creative expression. Designed in Berkeley, California, KMI controllers are fun and inspiring instruments as unique as you are. With Keith McMillen Instruments, everything is under control.

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36 Month Special Financing*

On Keith McMillen Instruments qualifying purchases now through August 2, 2026. 36 equal monthly payments required. Learn More

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MIDI Polyphonic Expression

MIDI Polyphonic Expression is the key to exploring gestures to control electronic instruments. The motions of your finger on the keys and pads translate into new dimensions of expression; control cutoff frequency of a filter with pressure, or bend the pitch with the vibrato you might expect from a fretless string instrument. Keith McMillen has a wide range of MPE controllers for all varieties of performer and producer.

QuNexus MPE MIDI Sequencer and Arpeggiator

Keith McMillen Instruments revisited their classic QuNexus MIDI controller and brought forth an update full of exciting new features to completely reimagine the instrument. The QuNexus is now an affordable hardware MPE MIDI sequencer and arpeggiator, with three programmable tracks and all the CV/gate connections you’d want to control your software or modular synthesizers.

MIDI Foot Controllers

Keith McMillen Instruments is there to help when you have your hands full. Their signature MIDI foot controllers — the SoftStep 2 and the 12 Step — are among the most flexible and customizable MIDI foot controllers ever made. When you need a foot controller for your virtual pedalboard, rackmount effects processor, or synthesizer, KMI has you covered.

BopPad Drum Pad Controller

BopPad is the expressive drum pad control surface, tough enough for the most brutal percussive assault, yet sensitive enough to play with the lightest touch from your fingers. Each of the four quadrants can play up to five notes and four CCs mapped to pressure or position along the radius. Adding an electronic drum pad to your rig has never been easier, whether you’re behind the kit or programming beats.

K-Mix, the Audio Multi-tool

The K-Mix is the ultimate audio multi-tool — a programmable digital mixer, an audio interface, and a MIDI control surface in one portable package. K-Mix can be at the center of your bedroom studio, or on stage running sound for an entire playback system, or in a sub mix for recording drums, or at the core of an immersive multichannel audio installation. The sky is the limit with this incredibly adaptable piece of equipment.

Smart Fabric Sensors

At the core of Keith McMillen Instruments is a specially developed proprietary sensor fabric material — a variably resistive felted material imbued with carbon nanoparticles. This material, when used in conjunction with the proper circuit board traces, gives KMI controllers a robustness that comes from having no moving parts.

* Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.