> 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

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### 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

<figure><img src="/files/TNDsgrAyzhJ7FOrSq21t" alt=""><figcaption></figcaption></figure>

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### 1. Filter Controls&#x20;

**Filter Type (Top Bar).** Choose from a variety of filter types, including morphing, comb, formant, and more.

**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.

**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.

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### 2. Display Controls&#x20;

**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.

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### 3. 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.


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