AudioPluginHost 5.4.3 : MIDI effect produces double notes?

[stephenk]

This!! →

@kmusic741

Just to be 100% clear, in case anyone is following the topic. Without the indicated line being added in the AudioPluginHost code, the plugin’s MIDI output is always added to its input. (Don’t see how that could ever work.)

in juce_VST3PluginFormat.cpp:

template 
void processAudio (AudioBuffer& buffer, MidiBuffer& midiMessages,
Vst::SymbolicSampleSizes sampleSize, bool isProcessBlockBypassedCall)
{
// …
    processor->process (data);
// ...
    midiMessages.clear(); // <== **REQUIRED TO ADD THIS**
    MidiEventList::toMidiBuffer (midiMessages, *midiOutputs);
// …
}

I had the exact same observation. Why would the notes be automatically passed through on top of what the plugin is generating? Thank you!!

By the way, I am interested in developing MIDI only plugins as well, and I am using the modifications in this thread to rebuild the AudioPluginHost to have an actual MIDI Output, so you don’t need to put other plugins inside it:

"audio plugin host" MIDI Output

Hey all, I like to use the "audio plugin host" under the "examples" folder (recently moved from "extras") to debug my VST's. It's lightweight, I can configure I/O how I want, doesn't crash as violently as some hosts, etc. My newest VST produces MIDI output that I would like to send to an external MIDI device, but the "audio plugin host" has no filter for MIDI Output despite being configurable from its AudioDeviceSelectorComponent. I noticed that the AudioProcessorGraph::AudioGraphIOProcessor n…

So my test of the ArpeggiatorDemoPlugin looks like this:

This has the bogus Audio Input required to make the Arpeggiator actually work, as detailed here:

numSamples is always zero in ArpeggiatorTutorial

OK @stephenk here is my first workaround class Arpeggiator : public AudioProcessor { public: //============================================================================== Arpeggiator() : AudioProcessor (BusesProperties().withInput("Input", AudioChannelSet::mono(), true)) // seem to need for sampleRate // : AudioProcessor(BusesProperties()) // add no audio buses at all - Original, doesn't work { addParameter (speed = new AudioParameterFloat ("speed", "Arpeggi…

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