# Improve the explosion

If you test your experience, you’ll find that the explosion repeats continuously. If you recorded a dramatic response, it may also not match the timing of the explosion. See the following sections for instructions on how to improve the explosion animation.

## Shorten the explosion

1. On the timeline, select the cog icon for the `paper_co2` button.
2. In the **Triggered Effects** section, select the cog for the **Explosion (Huge)** IFX.
3. In the **Current Effect Options** for the explosion IFX, in the **Length** field, enter `00:00:02`. The explosion will only be active for two seconds.
4. Select **SAVE EFFECT**.

## Trim the dramatic response recording

1. On the timeline, select the cog icon for the `paper_co2` button.
2. In the **Triggered Effects** section, select the cog for the recording.
3. If want to trim time from the start of the recording, at the bottom of the **My Recordings** options, enter the number of seconds that you want to trim in the **Start Time Offset** field.
4. If you want to trim time from the end of the recording, deduct the required number of seconds from the value in the **Length** field.
5. Select **SAVE EFFECT**.
6. Test your experience and, if further refinement is required, repeat from Step 1.

<figure><img src="https://3460182399-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FwVx6bvwqEE7tD0TYOcfj%2Fuploads%2Fgit-blob-4615d746ba2b0ecedfcb9511bbd20498f746beaf%2Ftut_train_paper_explosion.jpg?alt=media&#x26;token=18e2b192-67bb-4ffd-9832-4cb33878661f" alt=""><figcaption><p>Explosion synchronized with recorded reaction</p></figcaption></figure>