Keith McMillen Instruments 12 Step w/ MIDI Expander firmware

Latest firmware: 1.0.7

1.0.7released 22 Jan 2025

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.

Last checked 11 Sep 2026

Download 1.0.7 from Keith McMillen Instrumentsopens in a new tab — keithmcmillen.com

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 — keithmcmillen.com

Get Keith McMillen Instruments 12 Step w/ MIDI Expander firmware alerts

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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 manual & official pages

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 11 Sep 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) →

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