> For the complete documentation index, see [llms.txt](https://docs.tachyon.video/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tachyon.video/how-to/map-a-midi-slider.md). # Map a MIDI Slider **Gear** * A MIDI Controller (the AKAI MPD24 is used in this example). ## **1. Add a MIDI Controller.** {% embed url="" %} 1. Open the I/O Manager module. Select **{System > I/O Manager}** or press **`Alt`****+****`I`**. 2. Select the MIDI tab. 3. Select an empty slot from the Active Devices list. 4. Select a device from the Available Devices list to assign it. 5. Enable the **`Show midi messages`** button 6. Validate the MIDI Controller assignation by watching the incoming MIDI messages ## **2. Bind a Physical Slider to TACHYON.** {% embed url="" %} 1. Open the Output Control tool. Select **{System > Tools > Output Control}** or press **`Alt`****+****`O`**. 2. Open the Mapping Manager module. Select **{System > Mapping Manager}** or press **`Alt`****+****`N`**. 3. Activate the **`Control Learning`** toggle. (The UI will be tinted in red as long as Control Learning is enabled.) 4. Navigate back to the Output Control module and select the Master Contrast slider. 5. Assign the Master Contrast slider to the MIDI controller by moving one of its sliders. 6. Deactivate the **`Control Learning`** toggle. 7. Validate the slider assignation by watching its the repercussion in the UI. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.tachyon.video/how-to/map-a-midi-slider.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.