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Keith McMillen Instruments 12 Step w/ MIDI Expander firmware

Keith McMillen Instruments discontinued Device launched 2011

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Discontinued · Latest firmware

1.0.7
released 22 Jan 2025
Get 12 Step Editor includes the firmware

Keith McMillen Instruments no longer makes the 12 Step w/ MIDI Expander.

What's new in 1.0.7

### Editor 3.0.7, Firmware 1.0.7 (2025-01-22) - Bug fixes: - To address issues with preset corruption, we've updated how the 12 Step display behaves when receiving presets from the editor and loading presets on the device. - When the preset setlist is sent from the editor to the device, the 12 Step display will now show a counter with the number of presets received. If there is an error when the presets are sent, the display will show an error message "PRST / ERR / SEND / AGAN". - When loading a preset on the device, the red LEDs next to each preset slot will correctly indicate the available preset slots. - When loading a preset on the device, the 12 Step will briefly (1 second) show the preset number before showing the preset name. - False triggers (ghost notes): Implemented a more sophisticated hysteresis noise filter that only needs 2 ADC samples. This should prevent ghost notes and false triggers experienced by some users after updating to firmware 1.0.5. ### Editor 3.0.5, Firmware 1.0.5 (2024-06-24) - New Features/Changes: - Added global key on/off thresholds to settings tab. - Reduced key-on latency and improved key sensitivity, especially for black/accidental keys. - Keys pressure now automatically scales/calibrates based on the peak key value received since power on. - Bug Fixes: - Fixed an over-indexing error that caused unexpected behavior under very specific conditions. ### Editor 3.0.4, Firmware 1.0.4 (2024-04-08) - Bug Fixes: - Program Changes received from expander port (legacy 12 Step1) now control presets. - Pitch Bend messages sent to CV interface now properly scale with calibration values. - Firmware update process throttled to 256 bytes every 4ms, bootloader locked. ### Editor 3.0.2, Firmware 1.0.2 (2024-03-06) - Bug Fixes: - Added extra steps to bootloader installation process to account for Windows MIDI drivers.

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Last checked 22 Oct 2026

Release notes on files.musekinetics.com ↗

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The Keith McMillen Instruments 12 Step w/ MIDI Expander is no longer made, but Keith McMillen Instruments can still ship firmware for it and we keep checking the official download page. One message per release. No spam, no newsletter.

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How to update the Keith McMillen Instruments 12 Step w/ MIDI Expander

Firmware is bundled with the 12 Step Editor software. Download the Editor for your OS (Mac or Windows) from keithmcmillen.com/downloads/, install it, connect your 12 Step via USB, and open the Editor — it will detect and prompt you to update the firmware automatically.

What you need

12 Step Editor — the software Keith McMillen Instruments uses to load firmware onto the Keith McMillen Instruments 12 Step w/ MIDI Expander. Download links below.

Just for reference. For complete and up-to-date instructions, always refer to the manufacturer's official firmware page.

Drivers & software for the Keith McMillen Instruments 12 Step w/ MIDI Expander

The Keith McMillen Instruments 12 Step w/ MIDI Expander is updated with 12 Step Editor, published by Keith McMillen Instruments.

Download 12 Step Editor from Keith McMillen Instrumentsopens in a new tab — musekinetics.com

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Keith McMillen Instruments 12 Step w/ MIDI Expander firmware update history

Changelogs summarised from the manufacturer's release notes.

1.0.722 Jan 2025

Release notes for this version are listed above.

Release notesopens in a new tab — files.musekinetics.com

Tracked in 1 rig on FW//RADAR.

Keith McMillen Instruments 12 Step w/ MIDI Expander firmware FAQ

What is the latest firmware for the Keith McMillen Instruments 12 Step w/ MIDI Expander?

The latest firmware for the Keith McMillen Instruments 12 Step w/ MIDI Expander is version 1.0.7, released on 22 Jan 2025. FW//RADAR last checked Keith McMillen Instruments's official page on 22 Oct 2026.

How do I update the Keith McMillen Instruments 12 Step w/ MIDI Expander?

Firmware is bundled with the 12 Step Editor software. Download the Editor for your OS (Mac or Windows) from keithmcmillen.com/downloads/, install it, connect your 12 Step via USB, and open the Editor — it will detect and prompt you to update the firmware automatically. Full instructions on Keith McMillen Instruments's official firmware page.

What software do I need to update the Keith McMillen Instruments 12 Step w/ MIDI Expander?

You need 12 Step Editor, available from Keith McMillen Instruments's support site.

Where can I download Keith McMillen Instruments 12 Step w/ MIDI Expander firmware and drivers?

Directly from Keith McMillen Instruments's official firmware page — FW//RADAR links to the source and never hosts firmware files. Official firmware page →

Where can I find the Keith McMillen Instruments 12 Step w/ MIDI Expander manual?

The official Keith McMillen Instruments user manual is a PDF hosted on files.keithmcmillen.com. Keith McMillen Instruments 12 Step w/ MIDI Expander user manual (PDF) →

Is the Keith McMillen Instruments 12 Step w/ MIDI Expander still receiving firmware updates?

The Keith McMillen Instruments 12 Step w/ MIDI Expander is discontinued: Keith McMillen Instruments no longer makes it. The latest firmware we recorded is 1.0.7 from 22 Jan 2025. FW//RADAR keeps checking Keith McMillen Instruments's official page, so a new release would show up here.

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