> For the complete documentation index, see [llms.txt](https://manual.minimal.audio/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.minimal.audio/current-manual/sound-engine/filters.md). # Filters *** ### Overview Current includes two multi-mode filters. The filters can be routed in series or parallel and provide a variety of types, including morphing, comb, vowel, and more. Perfect key tracking is also available for perfectly tuned resonance and resonator effects.
*** ### 1. Filter Types **Filter Type (Top Bar).** Choose from a variety of filter types, including morphing, comb, formant, and more. The Filter Type menu groups the filter types into six categories: Basic, Morphing, Creative, Formant, Comb and Phaser. The Morphing category includes the morphing filter at four slopes: Morph 12, Morph 24, Morph 36 and Morph 48. *** ### 2. Display Controls **Filter Inputs.** Choose which sound sources will be sent through the filter. **Filter Mix.** Control the balance between the incoming signal and the filtered output. *** ### 3. Filter Controls **Cutoff.** Adjust the filter's frequency in Hz or as a semitone offset in key track mode. **Key Track Mode.** When activated, the filter will track the pitch of each individual note in the same way as the oscillators, and **Cutoff** will offset this frequency in semitones. Key-tracked cutoff follows the **Global Tune** setting. **Resonance.** Adjust the resonance of the filter. Higher values will result in sharper peaks in the frequency spectrum. **Filter Spread.** Adjust the relative cutoff of the left and right channels to create wide stereo filtering effects. Positive values gradually increase the right filter and lower the left filter. Negative values have the opposite effect. **Morph.** Manipulate the internal filter configurations to create more nuanced and complex effects. The filter will be changed in different ways depending on the selected filter type. The precision of filter modulation follows the **Audio accuracy** setting in [Global Settings](/current-manual/additional-settings/global-settings.md). *** ### 4. Filter Routing **Series Routing.** In **Series** mode, **Filter 2** processes the output of **Filter 1**. It is also possible to add an input source to **Filter 2** separately from **Filter 1**. **Parallel Routing.** In **Parallel** mode, both filters will work independently of each other. Any combination of the two separate filters can be used to process each input. --- # 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 by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://manual.minimal.audio/current-manual/sound-engine/filters.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.