How can I make process run?

I can build and run the VST but it doesn’t seem like process is running. The print statements aren’t returning anything here, they do work in controller though.

tresult PLUGIN_API Maynard_Virtual_TrumpetProcessor::process (Vst::ProcessData& data)
{
//— First : Read inputs parameter changes-----------
if (data.inputParameterChanges)
{
int32 numParamsChanged = data.inputParameterChanges->getParameterCount ();
for (int32 index = 0; index < numParamsChanged; index++)
{
if (auto* paramQueue = data.inputParameterChanges->getParameterData (index))
{
Vst::ParamValue value;
int32 sampleOffset;
int32 numPoints = paramQueue->getPointCount ();
switch (paramQueue->getParameterId ())
{
case GainParams::kParamGainId:
if (paramQueue->getPoint(numPoints - 1, sampleOffset, value) == kResultTrue)
mGain = value;
FDebugPrint(“mGain = %f\n”, mGain);
break;
}
}
}
}
FDebugPrint(“Process is working\n”);
//— Here you have to implement your processing

if (data.numSamples > 0)
{
	//--- ------------------------------------------
	// here as example a default implementation where we try to copy the inputs to the outputs:
	// if less input than outputs then clear outputs
	//--- ------------------------------------------
	
	int32 minBus = std::min (data.numInputs, data.numOutputs);
	for (int32 i = 0; i < minBus; i++)
	{
		int32 minChan = std::min (data.inputs[i].numChannels, data.outputs[i].numChannels);
		for (int32 c = 0; c < minChan; c++)
		{
			// do not need to be copied if the buffers are the same
			if (data.outputs[i].channelBuffers32[c] != data.inputs[i].channelBuffers32[c])
			{
				memcpy (data.outputs[i].channelBuffers32[c], data.inputs[i].channelBuffers32[c],
						data.numSamples * sizeof (Vst::Sample32));
			}
		}
		data.outputs[i].silenceFlags = data.inputs[i].silenceFlags;
			
		// clear the remaining output buffers
		for (int32 c = minChan; c < data.outputs[i].numChannels; c++)
		{
			// clear output buffers
			memset (data.outputs[i].channelBuffers32[c], 0,
					data.numSamples * sizeof (Vst::Sample32));

			// inform the host that this channel is silent
			data.outputs[i].silenceFlags |= ((uint64)1 << c);
		}
	}
	// clear the remaining output buffers
	for (int32 i = minBus; i < data.numOutputs; i++)
	{
		// clear output buffers
		for (int32 c = 0; c < data.outputs[i].numChannels; c++)
		{
			memset (data.outputs[i].channelBuffers32[c], 0,
					data.numSamples * sizeof (Vst::Sample32));
		}
		// inform the host that this bus is silent
		data.outputs[i].silenceFlags = ((uint64)1 << data.outputs[i].numChannels) - 1;
	}
}

return kResultOk;

}

which host are you using?

I’m using the VST test host Steinberg provides.