# Mappers Mappers listen a value in selected fixtures and changes other channel in relation Each mapper chan have multiple "rows". Each rows have three main informations : * what parameter is listened * the selection of fixtures where the mapper is applied * some key values used for channels interpolations --- # Agent Instructions: 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: ``` GET https://norbertrostaing.gitbook.io/blinderkitten/object-types/mappers.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.