AudioPluginHost not forwarding output parameters from Processor

General JUCE discussion
1

Hi,

I’m using the juce AudioPluginHost to host a vst3 plugin built using the vst3 sdk only.
I noticed that recent versions of the AudioPluginHost will make the parameter connection from the processor to the controller to fail.

I use the following code on the processor side:

int32 index;
IParamValueQueue* queue =
    data.outputParameterChanges->addParameterData (output_param.mParamId, index);
if (queue) {
	queue->addPoint (0, output_param.mValue, index);
}

And I expect it to trigger a setParamNormalized(...) call on the controller side

This works properly when using a AudioPluginHost built from a juce version 7.0.5 or below, but any version above (including latest develop) will fail in that regard.

Does this mean this type of connection is not supported anymore, or is this a bug ?

2

According to this page,

The processor can transmit outgoing parameter changes to the host… These are transmitted to the edit controller by the call of Steinberg::Vst::IEditController::setParamNormalized.

So, I think this a bug that was probably introduced here:

I’ll post an update once there’s a fix on develop.

2 Likes
3

Thanks for reporting this issue. A fix is now available on the develop branch:

4

Everything works as expected now, thanks !