# FMOD Event Player - Not sure what or how to add/edit these custom parameters

**URL:** <https://qa.fmod.com/t/fmod-event-player-not-sure-what-or-how-to-add-edit-these-custom-parameters/19609>\
**Category:** FMOD Studio\
**Created:** [December 4, 2022, 12:57am UTC](https://qa.fmod.com/t/fmod-event-player-not-sure-what-or-how-to-add-edit-these-custom-parameters/19609 "2022-12-04T00:57:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![TristanD79](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@TristanD79](https://qa.fmod.com/u/TristanD79)\
**Post date:** [December 4, 2022, 12:57am UTC](https://qa.fmod.com/t/fmod-event-player-not-sure-what-or-how-to-add-edit-these-custom-parameters/19609/1 "2022-12-04T00:57:49Z")

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Hello,

I’m examining some event files using the sound stage tab in the Event Player and can see there are some custom properties that are being shown (highlighted in the red box in the image below). What are these called officially (as in the term)? And where would I myself implement them?

Best  
Tristan

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/4/4b360cab42d4ef158b2c140959b18dfd10dae28c.png)