# \[Steam Audio\] Unable to set SIMULATION\_OUTPUTS DSP parameter
**URL:** https://qa.fmod.com/t/steam-audio-unable-to-set-simulation-outputs-dsp-parameter/19904
**Category:** FMOD Engine
**Tags:** cpp
**Created:** [February 22, 2023, 11:50pm UTC](https://qa.fmod.com/t/steam-audio-unable-to-set-simulation-outputs-dsp-parameter/19904 "2023-02-22T23:50:06Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@IainWinter](https://qa.fmod.com/u/IainWinter)
#### Post date: [February 22, 2023, 11:50pm UTC](https://qa.fmod.com/t/steam-audio-unable-to-set-simulation-outputs-dsp-parameter/19904/1 "2023-02-22T23:50:06Z")
Hi,
This may be the wrong forms for this, but have any of you run into this problem?
I am new to using Steam Audio and wanted to get something simple setup to test it out in a C++ project using FMOD to handle the audio. I followed the [guide](https://valvesoftware.github.io/steam-audio/doc/fmod/guide.html) and it seemed to work up until I needed to pass the results of the [simulation back to FMOD](https://valvesoftware.github.io/steam-audio/doc/fmod/guide.html#model-occlusion-by-geometry). When I call dsp-\>setParameterData, it throws an access violation where it seems to try and read some data at the address equal to the direct.flags var.
Are there additional steps before I can set this parameter? I can set integer params, and they take effect, but when I try to set (or get) this data param it fails. When getting it errors with an invalid param.
I’ve spent a couple hours on this to no avail, so any help would be appreciated.
Thanks,
Iain
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### Author:  [@IainWinter](https://qa.fmod.com/u/IainWinter)
#### Post date: [February 23, 2023, 3:21pm UTC](https://qa.fmod.com/t/steam-audio-unable-to-set-simulation-outputs-dsp-parameter/19904/2 "2023-02-23T15:21:13Z")
Issue was with docs see [[FMOD] Unable to set SIMULATION\_OUTPUTS DSP parameter :: Steam Audio General Discussions](https://steamcommunity.com/app/596420/discussions/0/3774616756094700096/)