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Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface
Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface

Keith McMillen Instruments K-MIX Mixer, USB Interface, Control Surface

Condition: New


Out of stock



Input Channels:

8 Balanced Inputs,

Signals up to +28 dBu

Output Channels

10 Outputs (8 balanced)

Bit Depth

24-bit AKM converters

110db dynamic range

Sample Rate

44.1kHz, 48kHz, 88.2kHz, 96kHz



Analog Inputs

2x XLR/TRS combo jacks

  • XLR mic/line inputs (balanced)
  • Hi-Z Inst/Line 1/4" TRS Inputs (balanced)

6x 1/4" TRS connectors (line/phono, balanced)


Analog Outputs


8x 1/4" / 6.4 mm TRS connectors (balanced)


1x Micro-USB (Audio I/O, MIDI I/O, Power)
1x Mini-USB (Power, Expander MIDI)




8 channel faders (75 mm)
12 LED indicators per channel fader
1 master fader with 24 LEDs
MIDI position CC output on all faders

Rotary Encoder


4 rotary controls (360°)
16 LEDs per rotary
MIDI position CC output on all rotaries



9 channel select buttons
4 bank select buttons
17 function buttons
MIDI note output on all buttons


Mic Preamp


2x ultra low-noise μPre mic pres

Phantom Power

+48 V or 12V phantom power


+60 dB additional gain

THD + Noise

-105.12 dBu @ 0 dB gain, 20 Hz - 20 kHz (unweighted)
-116.49 dBu @ 0 dB gain, 20 Hz - 20 kHz (A weighted)


-127.0 dBu, 150 ohms @ 20Hz - 20kHz, max gain (unweighted)

Frequency Response

± 0.03dB @ 20Hz - 20kHz (44.1 kHz, unweighted)
± 0.15dB @ 20 Hz - 40 kHz (96 kHz, unweighted)




3-band semi-parametric EQ
±18 dB cut/boost


Compressor/Limiter on each channel
Adjustable threshold, attack, release, and makeup gain


Noise gate on each channel
Adjustable threshold, attack, release, and gain reduction


Master reverb with individual sends per channel


Quadraphonic, 5.1, 7.1, and Octophonic surround output
Each channel assignable to one of four surround panners

Manufacturer's Description


Audio Interface

  • USB Bus Powered
  • Ultra-Low Noise µPre Preamps
  • High-End AKM Converters
  • 32-bit Floating Point Signal Path
  • 8-in/10-out Audio

Programmable Mixer

  • Per Channel DSP
  • Flexible Routing
  • Standalone Quad 5.1, 7.1 and Octo Surround Mixer
  • Onboard Preset Storage
  • No Computer Required

Control Surface

  • Ultra-Sensitive Precision Rotaries and Faders
  • User Assignable MIDI Controls
  • Light Weight and Portable
  • Rugged Construction, No Moving Parts

Our Mission

Our team of musicians fuses the spirit of the local guitar shop with the convenience of the web by creating a reliable and worry-free buying experience.

At Music Store Live, our goal is to revolutionize the way gear is bought online. It’s not just about videos and know how; it’s about the person on the other end of the line. Whether you are in Tokyo or Toledo, we invite you to experience the reality of a living online music store and help us shape the best buying experience possible. As you'll see in the video below, we're musicians just like you. We strive to offer the best gear, the best online experience, and the best personalized service in the industry. We invite you to get to know our team, and we would love the opportunity to get to know you too!

Free Shipping - Free Return Shipping - 30 Day Returns

At we are proud to offer free return shipping and a 30-day return policy in the 48 contiguous states on all new* items over $30. It's all part of our mission to bring the guitar shop to your living room. This policy allows you to get your gear hassle-free and try it with your own rig to be sure that it truly fits with your playing style and sound. If it doesn't work the way you had hoped we'll send you a prepaid return label and work up an exchange or issue you a refund once we get the item back in the same condition it was purchased. It's that simple.

Please allow 2-4 business days from the receiving date for returns to be processed.
  • Your order must ship to the billing address associated with your credit card, PayPal, or other method of payment (unless an alternate shipping address has been approved by an MSL Gear Specialist).
  • If you want the shipment to be held at a shipping company hub it is your responsibility to make those arrangements directly with the shipping company.
  • An indirect signature will be required upon delivery for all transactions over $250. If you would like to require a signature on a transaction of less than $250, please request it when you place your order.
  • We do not insure packages valued under $3,000. If you would like to add insurance for delivery or return please request it when requesting your order or initiating your return.
  • All returns are subject to a Tech Check upon arrival. Any instrument that is returned with damage, wear and tear (including pick marks), missing or replaced parts, missing protective or packing materials are not eligible for a full refund.
  • *Used / Open Box/ Vintage / Clearance items carry our same return policy, except with a 3­ day return window.
  • Orders shipped within California will be subject to 7.25% state sales tax.

In most cases we ship same day if your order is placed by 12 p.m. EST Monday thru Friday!

Return Policy Details
Is your instrument just not doing it for you? We understand and we absolutely want you to be thrilled with any gear that you buy from If you're not happy with your order, you can return it to us at no charge within 30 days of delivery.

  • Customers outside the continental USA must pay their own return shipping and are responsible for all applicable taxes and fees.
  • The return policy does not apply to custom orders or modifications (pickup installs, etc)
  • Contact MSL at or (866) 256-5725 to begin the return process. You can request a refund, store credit, or exchange.
  • We'll provide you a return label via email.
  • Ship the item back to us in its original packaging using the provided return label.
  • Customer is responsible for returning the item to Music Store Live in its original condition.
  • A refund or exchange will be issued within 3 business days from our receipt of the returned item.
  • All returns will go through a technical inspection and are subject to a restocking fee if the item is not returned in its original condition. Restocking fee to be determined by MSL.

Layaways & Financing


  • Deposit a non-refundable minimum of 10% down of the purchase price on anything in stock
  • Contact MSL at or (866) 256-5725 to place your initial deposit.
  • Pay it off at your convenience within 30 days.
  • $100 layaway fee for each additional month over the initial 30 days (on most items).


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