Calling multiple functions with delay on a Knob's Callback

[Christoph Hart]

I've pushed an experimental build flag that might help with the issue. Please pull HISE and export your plugin with the HI_DONT_SEND_ATTRIBUTE_UPDATES flag set in your Extradefinitions. This should deactivate the internal messaging and hopefully fix the crash. Let me know if that helped.

[resonant]

@Christoph-Hart Thank you for the update.

Unfortunately, this update is not a solution for the crash. The plugin seems a little bit relaxed but the crash still happens.

I sent you a minimal project of this FX plugin privately.

We tried this crash problem on different users and different computers. My advice to replicate the problem there is if possible, on Windows in Cubase 9/10/11 or Studio One 5/6 create 3 individual DAW projects (Using this FX plugin on the channels of a real song project will give a much more realistic result):

• 3 plugins
• 8 plugins
• 20 plugins

Some computers crash at 3 plugins, some at 20.

I also discovered that, if I insert only a ShapeFX module at the begining of the project (no setAttribute or parameter usage for this module), it reduces the crash because the loading time increases and this prevent crash. But the plugin seems still unstable.

I think the real cause of the crash is all of the parameter settings, UI elements...etc. are being called simultaneously at the same time on DAW project loadings. A little bit delayed calls can solve this issue.

[d.healey]

@resonant So the issue doesn't happen in a single plugin instance but when multiple are used?

[resonant]

@d-healey said in Calling multiple functions with delay on a Knob's Callback:

@resonant So the issue doesn't happen in a single plugin instance but when multiple are used?

Yes exactly.

[d.healey]

@resonant Are you doing realtime stuff in the UI thread?

[resonant]

@Christoph-Hart Any progress for this issue?

[Christoph Hart]

No, I need to test this. Can you give me a list of all host / OS combinations. I know Cubase is very critical when it comes to UI CPU pressure but I can‘t est on Cubase at the moment.

[resonant]

@Christoph-Hart I understand. We've tested on 11 different Windows 10 machines.

• 8 crashes are coming from Cubase version 9 or 10 or 11 unfortunately.
• 2 crashes from Studio One 5 and 6.
• 1 crash from Reaper 6.

For other DAWs and macOS, no known crashes for now. But I can definitely say that, if the plugin works in Cubase, it will work on everywhere.

For the NFR License, as a Developer you can write to Steinberg and ask from them, they are giving NFR Licenses to the Developers for free. If you get version 11, you can rest assured because you will reproduce the issue in there.

[Christoph Hart]

@resonant yeah I wrote them for an NFR but never heard back, then I stopped caring.

[d.healey]

@Christoph-Hart Have you used up your free trial?

[orange]

@Christoph-Hart said in Calling multiple functions with delay on a Knob's Callback:

@resonant yeah I wrote them for an NFR but never heard back, then I stopped caring.

They have changed their NFR License section lately. The new system is very cool and easy to use/update, their response is now quick. Maybe giving a one more shot would be useful.

[DanH]

@orange is there a form we can fill out or specific email to contact? Or just their info@ one?

[orange]

@DanH Just using the website support ticket system worked here.

[resonant]

Still no luck :/

If there is no fix for this for now, what can we do as an alternative shortcut hack?

[ulrik]

@resonant based on the snippet from @Christoph-Hart , this will make sure all functions will be executed, and in the right order, even if you touch the knob.

You say you have a lot of knobs and functions to be executed, so maybe this is not an alternative for your project but anyway, here's my go for it...

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[resonant]

@ulrik Thank you for the suggestion.

Maybe there are other methods instead of delaying functions to prevent multi instance crash.

[orange]

@resonant said in Calling multiple functions with delay on a Knob's Callback:

Maybe there are other methods instead of delaying functions to prevent multi instance crash.

I've been seeing this issue for a while. I've made a few suggestions here for this problem: https://forum.hise.audio/topic/3677/multi-instance-daw-crash-issue-guide?_=1680361788380

Apart from these, my suggestion is: if you are using more than one setAttribute calls at the same time and if you are sure exactly where the crash comes from the code (it's generally where you used multiple setAttribute methods mostly or on the Oversampling function), it may sound a bit silly, but I recommend placing setBypassed between the setAttribute lines :) For example for a Simple Gain or Curve EQ module.

I discovered that adding setBypassed interestingly reduces bottlenecks caused by multiple setAttribute lines. Especially watch out the Oversampling functions. It's worth a try.

BTW, assigning setBypassed to a Knob will cause errors while turning the knob. But you can assign it to a Button, or ComboBox.

[d.healey]

Can you reduce the number of setAttribute calls by connecting through processor/parameter id instead?

[resonant]

@orange said in Calling multiple functions with delay on a Knob's Callback:

@resonant said in Calling multiple functions with delay on a Knob's Callback:

I discovered that adding setBypassed interestingly reduces bottlenecks caused by multiple setAttribute lines. Especially watch out the Oversampling functions. It's worth a try.

I'll try this, Thanks!

[resonant]

@d-healey said in Calling multiple functions with delay on a Knob's Callback:

Can you reduce the number of setAttribute calls by connecting through processor/parameter id instead?

Unfortunately not. Because in this project, I use multiple modulations with one knob.