# Scale and Tuning

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### Overview

Use the scale and tuning controls to ensure Evoke only plays notes relevant to your input material. We recommend that you set these whenever loading a new instance to improve detection and enable scale-aware processing (e.g., diatonic harmonization).

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### 1. Keyboard

Evoke’s **Keyboard** lets you enable or disable specific notes in your scale. Click any key to toggle it.

It also provides visual feedback: the currently playing note, the currently detected note, and which notes are included in the scale.

{% hint style="info" %}
The currently detected note appears as a white highlight at the top edge of its key. Use this to decide which notes to include or exclude from the scale. The longer a pitch is detected, the longer the highlight persists before fading out.
{% endhint %}

### 2. Scale Controls&#x20;

**Scale Root.** Choose the root note for the selected scale. Changing the root will transposes all scale notes accordingly.

**Scale Type.** Select a preset scale for pitch tracking and harmonization. You can further customize it by toggling individual keys on the **Keyboard**.

{% hint style="info" %}
Even if you customize **Chromatic** to match a specific scale, harmonization remains chromatic. Scale-aware (diatonic) processing is enabled only when you select a non-chromatic option in the **Scale Type** dropdown.
{% endhint %}

### 3. Reference Frequency

By default, Evoke uses the standard concert pitch **A4 = 440 Hz**. Change the **Reference Pitch** to match sources tuned differently (e.g., **A4 = 432 Hz**) when required.

### 4. Preset Locking

When **Preset Locking** is on, all **Keyboard Panel** settings, including **Input** and **Pitch Range**, are preserved when you change presets.

This is the default behavior in Evoke because these settings are tied to the input signal rather than the preset. Turn **Lock** off to load the **Keyboard Panel** settings saved with the selected preset.

Settings affected by **Preset** **Locking:**

* Scale Root
* Scale Type
* Reference Pitch
* Keyboard Notes
* Input Gain
* Input Gate