# Car Engine Boost - ON/LOOP/OFF - Help/Advice

**URL:** <https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298>\
**Category:** FMOD Studio\
**Created:** [January 30, 2022, 7:14am UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298 "2022-01-30T07:14:51Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![fractanimal](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/fractanimal/32/3897_2.png) [@fractanimal](https://qa.fmod.com/u/fractanimal)\
**Post date:** [January 30, 2022, 7:14am UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298/1 "2022-01-30T07:14:51Z")

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Hi everyone!

I have a car engine boost set up in FMOD. Please see the screenshot.

 ![fmodboost](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/d/d98e3817db973a7ba7e8f7b62ab46c7b19978a8a.jpeg)

I have a short video uploaded to youtube but it’s saying I can’t add links to this host?

My question is-\>  
I’d like to control this with one parameter - an ON/OFF type of thing.

It’s currently set up so as I drag “boost on” parameter up, it starts, goes into the loop, then ends, but I’d really like to be able to turn it on when I drag the parameter up, and off when I drag the parameter down.

Is there any way of doing thing? If not, is there a better way to set this up than I currently have it?

Can you give me any advice or provide a tutorial which covers something that will translate across to this boost sound? Thanks so much!!!

fract

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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:** [January 30, 2022, 11:52am UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298/2 "2022-01-30T11:52:12Z")

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> [@fractanimal](#):
>
> but I’d really like to be able to turn it on when I drag the parameter up, and off when I drag the parameter down.

Do you mean you want to trigger the start when the parameter starts going up, no matter the value, and conversely stop when it goes down?

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**Author:** ![fractanimal](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/fractanimal/32/3897_2.png) [@fractanimal](https://qa.fmod.com/u/fractanimal)\
**Post date:** [January 30, 2022, 4:06pm UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298/3 "2022-01-30T16:06:41Z")

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Yes exactly! It seems like I somehow need to swap the start with the end when the parameter comes back down.

I know how to do this with a second parameter by automating the volume between the Start and end.

But is there a way to do it as you say, with the one parameter?

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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:** [January 30, 2022, 7:33pm UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298/4 "2022-01-30T19:33:43Z")

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The cleanest way would be to program that logic in the game code. But if you absolutely want to do that in fmod, here’s a technique which should do the trick: [Locomotive Engine Sounds -- A bit of an enigma - #3 by Alcibiade](https://qa.fmod.com/t/locomotive-engine-sounds-a-bit-of-an-enigma/16911/3)

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**Author:** ![fractanimal](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/fractanimal/32/3897_2.png) [@fractanimal](https://qa.fmod.com/u/fractanimal)\
**Post date:** [March 26, 2022, 1:04am UTC](https://qa.fmod.com/t/car-engine-boost-on-loop-off-help-advice/18298/5 "2022-03-26T01:04:30Z")

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Great! Thanks so much for that, It really helped.