# Best practice for a sound effect that plays whenever a parameter is changed, but NOT when the event starts

**URL:** <https://qa.fmod.com/t/best-practice-for-a-sound-effect-that-plays-whenever-a-parameter-is-changed-but-not-when-the-event-starts/24561>\
**Category:** FMOD Studio\
**Created:** [October 12, 2026, 1:47am UTC](https://qa.fmod.com/t/best-practice-for-a-sound-effect-that-plays-whenever-a-parameter-is-changed-but-not-when-the-event-starts/24561 "2026-10-12T01:47:32Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lincolnennis](https://avatars.discourse-cdn.com/v4/letter/l/b4bc9f/32.png) [@lincolnennis](https://qa.fmod.com/u/lincolnennis)\
**Post date:** [October 12, 2026, 1:47am UTC](https://qa.fmod.com/t/best-practice-for-a-sound-effect-that-plays-whenever-a-parameter-is-changed-but-not-when-the-event-starts/24561/1 "2026-10-12T01:47:32Z")

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Hi there, Im testing out an event right now, and basically I want a crash sound to play whenever the player steps on or off of a platform, so I have a simple parameter sheet right now set to play that sound when the parameter changes. However the sound also plays whenever the event starts (because the parameter will always be yes or no), and I cannot for the life of me work out a way to have it just ignore the parameter at the start of the event. Is there a better way I should be doing this?

 ![Screenshot 2026-10-11 183929](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/9/9bf16f8bda4e822d140a16b7dfe83111189d456f.png)