# Locomotive Engine Sounds -- A bit of an enigma

**URL:** <https://qa.fmod.com/t/locomotive-engine-sounds-a-bit-of-an-enigma/16911>\
**Category:** FMOD Studio\
**Tags:** unity\
**Created:** [March 19, 2021, 9:33pm UTC](https://qa.fmod.com/t/locomotive-engine-sounds-a-bit-of-an-enigma/16911 "2021-03-19T21:33:38Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Alcibiade](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/alcibiade/32/4284_2.png) [@Alcibiade](https://qa.fmod.com/u/Alcibiade)\
**Post date:** [March 20, 2021, 1:31am UTC](https://qa.fmod.com/t/locomotive-engine-sounds-a-bit-of-an-enigma/16911/3 "2021-03-20T01:31:47Z")

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After a bit of experimentation, I found out a way of triggering a sound going up and another going down, without creating a new parameter:

[![](https://img.youtube.com/vi/U_kRtk81OcY/maxresdefault.jpg "FMOD experiment") ](https://www.youtube.com/watch?v=U_kRtk81OcY)

It involves a “ghost” parameter, that follows the main one, but with a lower seek speed. So you can use it as an indicator of if you’re coming from above or from below!  
EDIT : there’s no sound due to a sample frequency issue, but you can see visually the sound triggering

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_[View the full topic](https://qa.fmod.com/t/locomotive-engine-sounds-a-bit-of-an-enigma/16911)._