Synthrotek MST MIDI to CV Expander Kit - Eurorack Module

Sorry, this listing has sold out.

Sold Out!

-- Eurorack Module Kit (not Assembled) --

Please note: this is an advanced build.

Please note: in order to use the Expander, your MST MIDI to CV Converter must have code version 1.3. If you have an older version of the software on your Converter, you will need to purchase a new PIC18 chip for the Converter in order to use it with the Expander; the software is not available for download. The version is written on the PIC18 chip itself, you can see it if you pull your module out of your case and look at the back. The PIC18 chip is available here.

The MST MIDI to CV Expander module is a tiny but extremely powerful expansion module for the MST MIDI to CV Converter. The Expander includes an arpeggiator and allows you to have additional CV, gate, velocity, modulation and aftertouch outputs on a separate MIDI channel. You can also set it to the same MIDI channel as the Converter and use one of the three note priority selections, which will allow you to do duophony/pseudo-polyphony. You can daisy-chain Expanders together to add even more channels.

The Expander really shines when it is used with a DAW. Multiple Expanders can be set to different MIDI channels in any sequencer (like Ableton for example), making live performance with your Eurorack simple.

The Expander connects to the MIDI to CV Converter using an I2C cable (included).


    • Three note priority modes: high note, low note or last note
    • Arpeggiator: forward, ping-pong, random modes
    • Manual MIDI Reset Button
    • Volts-per-octave trimmer accessible from the front panel
    • Velocity, Modulation and Aftertouch CV output jacks function independently but can be used simultaneously
    • Control the arpeggiator with a modular or MIDI clock
    • Pitch CV and gate outputs
    • Select MIDI channels 1-16 with an internal DIP switch
    • Gate / Note Priority LED indicator
    • Polarity protection

    • Current draw:
      • +12V: 55mA
      • -12V: 15mA
    • Module Depth: 48mm
    • Width: 2HP
Please note: the Expander will not work without the MST MIDI to CV Converter.

Product Specs

Brand New (New)
MST MIDI to CV Expander Kit - Eurorack Module

About The Seller

MeMe Antenna
Joined May 2016
Brooklyn, NY, United States


Accepted Payment Methods

Shipping Policy

Ships from Brooklyn, NY, United States to:

Continental U.S.
Everywhere Else

We will ship with tracking to the listed regions with following shipping method. To negotiate shipping rates and request specific shipping method, please contact us.

Domestic: The standard shipping for small items are shipped with USPS First-class or Priority. Larger items will be shipped with Ground Service (UPS or FedEx).

International: Small and less then $400 items will be shipped with USPS First-class. Larger or $400 or greater items will be shipped with USPS Priority.

** Your order may be subject to import taxes, customs duties and fees by the destination country.

** USPS First-class international shipping is shipped with "Delivery Confirmation" service. With this service, only eligible destination will get the confirmation. The tracking will stop and cease to update once ineligible shipments depart the U.S.. Other international shipping service will be traceable.

Tax Policies

United States - WA
Tax is calculated at checkout. Learn about why tax is required in this region.

Return Policy

Return Window

This item is sold As-Described and cannot be returned unless it arrives in a condition different from how it was described or photographed. Items must be returned in original, as-shipped condition with all original packaging.

MeMe Antenna

Brooklyn, NY, United States
Joined: May 2016

Seller Achievements