### Author:  [@matiaslizana](https://qa.fmod.com/u/matiaslizana)
#### Post date: [December 21, 2019, 2:20pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/1 "2019-12-21T14:20:54Z")
Hi, I’m developing a plugin and I don’t know why when I load one instance on studio, I debug my code and it calls create, setDataParameter and release multiple times (about 10), and this crashes my flow.
I made a blank project, using only 1 event, with 1 track, and instancing my plugin on pre-fader, also setting max-instances of that event to 1 (just for try), but it continues to call create a lot of times.
Can you tell me what’s happening with those callbacks?
Thanks
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [December 22, 2019, 9:17pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/2 "2019-12-22T21:17:28Z")
I have a similar issue where its not calling the creation callback on creating a user defined DSP with either `System::createDSP()` or `System::createDSPByPlugin()` (Core API)… A fix for these issues would be nice.
---
### Author:  [@matiaslizana](https://qa.fmod.com/u/matiaslizana)
#### Post date: [December 23, 2019, 11:13am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/3 "2019-12-23T11:13:02Z")
The worst part is for setDataParameter, because I have a bunch of data reading there, and every time I move another setFloatParameter knob I have on the plugin, the setDataParameter is calling and it tries to load again all the info.
It seems like every change on a parameter affects to all callbacks. Also creation and destruction has problems about it as @Sunkin351 says.
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [January 7, 2020, 4:02am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/4 "2020-01-07T04:02:29Z")
Are you able to share the code you are using? Or a small version that reproduces the issue?
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [January 16, 2020, 2:38am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/5 "2020-01-16T02:38:20Z")
If you are fine with debugging C# code in Visual Studio, I’ll be glad to give you the code I use to reproduce it not calling the creation callback…
>
It leaves the plugin state uninitialized causing a debug assertion on line 33, or a NullReferenceException on line 47. (Or on line 253, due to the multi-threaded environment setup within FMOD.)
Though to be fair, I just ported the C++ example to C#, so you’d probably get the same problems there.
Edit: I even put a breakpoint in the Creation Callback to make sure it wasn’t being called on DSP creation.
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [January 22, 2020, 3:52am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/6 "2020-01-22T03:52:58Z")
You may need to check the C# wrapper, I was able to use our C# wrapper and get a custom DSP create callback triggered from a very basic example.
```
using UnityEngine;
public class CustomDSP : MonoBehaviour
{
FMOD.DSP_CREATECALLBACK createCallback = new FMOD.DSP_CREATECALLBACK(MyDSPCreate);
private void Start()
{
CreateCustomDSP();
}
public void CreateCustomDSP()
{
FMOD.DSP_DESCRIPTION dspDesc = new FMOD.DSP_DESCRIPTION()
{
version = 1,
create = createCallback,
};
FMOD.RESULT result = FMODUnity.RuntimeManager.CoreSystem.createDSP(ref dspDesc, out FMOD.DSP dsp);
Debug.Log("createDSP : " + result);
}
public static FMOD.RESULT MyDSPCreate(ref FMOD.DSP_STATE state)
{
Debug.Log("MyDSPCreate Callback");
return FMOD.RESULT.OK;
}
}
```
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [January 23, 2020, 11:05pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/7 "2020-01-23T23:05:58Z")
I wrote the C# wrapper I’m using… FmodAudio. Much research went into its construction. If you wanna check my work, by all means. Me and OP both have similar issues with FMOD dsp callbacks.
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [January 28, 2020, 3:17am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/8 "2020-01-28T03:17:52Z")
At this point I have not been able to reproduce the issue with or without our C# wrapper.
If anyone can provide a test project that reproduces the issue I can look into this further.
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [March 15, 2020, 10:49pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/9 "2020-03-15T22:49:36Z")
Newest patch seems to have fixed it. Though, one issue remains. `FMOD_DSP_STATE::instance` is invalid by the time `FMOD_DSP_DESCRIPTION::release` is called? Why’s this?
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [March 20, 2020, 4:16am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/10 "2020-03-20T04:16:07Z")
The instance should always be valid, is it possible you are overwriting it at all?
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [March 20, 2020, 5:56pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/11 "2020-03-20T17:56:08Z")
I am not. The handle is as it always was on my end.
Another small detail: Is the `FMOD_DSP_DESCRIPTION::release` callback decoupled at all from `FMOD_DSP_Release()`? In my wrapper, I’m releasing a resource right after but that resource is needed from the callback… (In short, my resource is unavailable by the time the callback is called…)
Edit: That could be why the handle is invalid by the time the callback is called.
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [March 24, 2020, 9:43pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/12 "2020-03-24T21:43:34Z")
Calling [`FMOD_DSP_Release`](https://fmod.com/resources/documentation-api?version=2.0&page=core-api-dsp.html#dsp_release) will cause the release callback set in the `FMOD_DSP_DESCRIPTION` to be called, at which point the instance will still be valid.
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [March 26, 2020, 7:43pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/13 "2020-03-26T19:43:49Z")
`FMOD_DSP_GetUserData()` reported it was invalid by that time. (And previous calls to the method from other callbacks worked fine, so…)
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [April 30, 2020, 4:13am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/14 "2020-04-30T04:13:55Z")
Was this ever addressed?
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [May 4, 2020, 12:16am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/15 "2020-05-04T00:16:40Z")
> [@cameron-fmod](#):
>
> At this point I have not been able to reproduce the issue with or without our C# wrapper.
>
> If anyone can provide a test project that reproduces the issue I can look into this further.
Any attempt to reproduce the issue has failed.
---
### Author:  [@Sunkin351](https://qa.fmod.com/u/Sunkin351)
#### Post date: [June 25, 2020, 9:40pm UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/16 "2020-06-25T21:40:30Z")
In the end, I was able to get everything working, and find out an important piece of information regarding DSP release/destruction. The release callback is decoupled from FMOD\_DSP\_Release() and is called at some later point in time. Not knowing this caused me some issues. But all is well.
---
### Author:  [@klater](https://qa.fmod.com/u/klater)
#### Post date: [February 28, 2023, 7:48am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/17 "2023-02-28T07:48:58Z")
I have a similar issue where the Create callback is called whenever I change any parameter. To make sure it’s not just happening in my own plugin project, I simply added
```auto
FMOD_DSP_LOG(dsp_state, FMOD_DEBUG_LEVEL_LOG, "Create_Callback", "Create_Callback is just called");
```
to FMOD\_Gain\_dspcreate() in the example fmod\_gain project, and it’s doing the same thing.
Here’s the logs that I’ve been getting whenever I move the gain knob.
```auto
23:42:30 Macro: Set Gain [#2 times]
23:42:30 fmod_gain.cpp(212), Create_Callback(): Create_Callback is just called
23:42:30 fmod_bank_loader.cpp(125), Manager::readBank(): fileversion = 141, compatVersion = 140 (oldest = 44, newest = 141)
23:42:30 Macro: Set Gain
23:42:30 fmod_gain.cpp(212), Create_Callback(): Create_Callback is just called
23:42:30 fmod_bank_loader.cpp(125), Manager::readBank(): fileversion = 141, compatVersion = 140 (oldest = 44, newest = 141)
23:42:30 Macro: Set Gain [#3 times]
23:42:30 fmod_gain.cpp(212), Create_Callback(): Create_Callback is just called
23:42:30 fmod_bank_loader.cpp(125), Manager::readBank(): fileversion = 141, compatVersion = 140 (oldest = 44, newest = 141)
```
---
### Author:  [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [March 7, 2023, 1:03am UTC](https://qa.fmod.com/t/plugin-multiple-callbacks-on-create-release-and-setdataparameter/15338/18 "2023-03-07T01:03:33Z")
I have not been able to reproduce this myself, although if you are using Live Update then the Studio API might be instantiating the DSP each time it’s touched.