# Add Vibrato or Remove AI-generated Vibrato
The AI vocal synth model generates vibrato effects at certain points based on MIDI information and the characteristics of the AI voices, among other factors. However, you might want a different result than the model's default. Let's learn how to manually add vibrato or remove the vibrato generated by AI.
## Add a vibrato
Vibrato is more suitable for longer notes, and the pitch of this note is relatively steady.
\[pic]
To add a vibrato on a note, you can use the vibrato tool from the pitch tool bar in the piano roll. After this vibrato tool selected, drag on a note to create the envelope.
To learn more about using this tool, please refer to
## Remove/edit AI-generated vibrato
Sometimes, AI will generate the default pitch with vibratos, this is because AI is trying to replicate the singer’s real performance.
\[pic]
There are 2 methods to remove this kind of vibrato:
1. Use the pitch brush to draw a steady pitch curve.
2. Use the modulation tool to make pitch flat: on the note you want to modify, long-press the left mouse button and drag down to smooth out the pitch line; if you drag it all the way down, the pitch will become a straight line. The white line in the image below is the pitch smoothed by the Modulation tool, while the gray line is the original pitch generated by the model. To learn more about the modulation tool, please refer to
If you still want a vibrato, but need to edit it. You can firstly use the modulation tool to remove the default vibrato, and then use the vibrato tool to add an editable vibrato envelope on the note you want to modify.
---
# 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://docs.acestudio.ai/guides/advanced-techniques-and-pro-tips/add-vibrato-or-remove-ai-generated-vibrato.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.