# Spectrum Filter
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### Overview
Evoke’s **Spectrum Filter** provides additional shaping of the resynthesized signal through spectral filtering. Filter shapes can be drawn directly on the **Resynth Response** in the center of the **Resynth View**. After creating a shape, further manipulate it using the **Spectrum Controls** in the bottom-right.
Use this for tonal adjustments in place of a traditional EQ, or design complex filter curves that can be modulated for creative movement.
***
### Spectrum Filter Response
The **Resynth Response** displays the current spectral envelope and can also be used to create custom filter shapes.
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### 1. Spectrum Filter Response
Hover over the **Resynth Response** to highlight the current (unmodulated) **Spectrum Filter** shape. Click and drag to edit the shape and create your own filter responses.
{% hint style="info" %}
Hold **Command** (macOS) or **Ctrl** (Windows) while dragging to edit only the odd bands on the response curve. Add **Option** (macOS) or **Alt** (Windows) to invert this behavior and edit only the even bands.
Double-click a band to reset it.
{% endhint %}
### 2. Spectrum Control Bar
Hover over the **Resynth Response** to reveal the **Spectrum Control Bar** in the top-right. Use it to perform actions such as generating and resetting the filter response.
**Randomize.** Click the dice icon to generate a random filter shape for inspiration and unexpected tonal shaping.
**Options Dropdown.** Click the wrench icon to view additional actions:
* **Reset.** Reset the filter shape so no processing occurs.
* **Low-pass.** Generate a centered low-pass filter that can be adjusted with the **Spectrum Controls**.
* **High-pass.** Generate a centered high-pass filter that can be adjusted with the **Spectrum Controls**.
* **Band-pass.** Generate a centered band-pass filter that can be adjusted with the **Spectrum Controls**.
* **Notch.** Generate a centered notch filter that can be adjusted with the **Spectrum Controls**.
* **Comb.** Generate a comb filter that can be adjusted with the **Spectrum Controls**.
* **Invert.** Vertically invert the filter shape, flipping each band’s gain value.
* **Reverse.** Horizontally reverse the filter shape, swapping each band’s frequency position.
***
### Spectrum Filter Controls
The **Spectrum Filter Controls** let you manipulate the entire filter response at once. Use them to tune the overall response or create movement when combined with modulation.
Hover over this area to highlight the affected filter response on the **Resynth Response**, including any modulation.
***
1. **Bypass.** Click the spectrum icon to enable or disable the **Spectrum Filter**.
2. **Spectrum Controls.** Additional spectrum shaping is controlled by three parameters:
**Tilt.** Adjusts the balance between low and high frequencies, tilting the filter toward brighter or darker sounds.
**Shift.** Moves the entire filter up or down in frequency, similar to a standard filter’s cutoff control.
**Scale.** Controls the intensity of the filter’s gain changes. At 0% the filter has no effect, while at 200% it exaggerates the response, pushing it toward extremes.
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