iOS: StreamByter AUv3 crashes in JUCE host (AudioPluginHost, Camelot) when moving parameters

[dev4am]

Hi JUCE team,

I’m reporting a reproducible issue with StreamByter (AUv3) when hosted in my JUCE-based app, and I can reproduce the same behavior in JUCE AudioPluginHost.

In AudioPluginHost, if I load StreamByter, open the “All Parameters” window, and move a parameter slider, the AU crashes showing the GUI window blank/transparent.

I can’t reproduce the same crash in AUM or Logic with the same plugin.

My current impression is:

• this may still be a plugin-side issue

• since it appears specifically with JUCE-based hosting, there may be an opportunity for an additional guard/check in JUCE to prevent a hard crash in this scenario.

I’m attaching a short video showing the behavior in AudioPluginHost.

StreamByter AU Crash Video - Google Drive

Please let me know what extra details would be most useful from my side.

Best regards,
Samuele

[reuk]

Thanks for reporting. This sounds very similar to the issue described here:

JUCE AUv3 plugin freeze in JUCE hosts (iOS)

Hi, I can’t figure what is going wrong here but it is quite easy to reproduce (tested with latest juce develop): Build the AUv3SynthPluginDemo from JUCE and install it on iOS. Build the AudioPluginHost and run it on iOS. Instantiate AUv3SynthPlugin, select the “Show all parameters” menu entry from the AudioPluginHost popup menu. Now the AudioPluginHost is showing the “Room Size” parameter of AUv3SynthPlugin, move it a bit: everything works as expected . Now rebuild the AUv3SynthPlugin so th…

We added a potential fix for this issue:

AU Host: Unify macOS and iOS parameter listener behaviour

Please could you try updating and check whether the issue persists when building AudioPluginHost from the develop or juce9 branches?