AudioDeviceManager Tutorial doesn’t seem to work properly with more inputs than outputs

Getting Started
#1

So in this demo, it provides the ability to select from multiple input and output ports.

This may be simply my misunderstanding of how this is supposed to work, but I have a MOTU 896 connected to my Mac OS X Mojave computer.

(I’ve enabled “show as stereo pairs”).

05%20PM
05%20PM816×499 85.9 KB

If I simply leave two outputs selected (Main 1+2), but I have a keyboard on inputs 1+2, and a microphone on input 7+8, It will process incoming audio only from Inputs 1+2, and ignore anything else because there are only two outputs selected.

You can see that it loops for only the total number of output channels.

   void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill) override
    {
        auto* device = deviceManager.getCurrentAudioDevice();

        auto activeInputChannels  = device->getActiveInputChannels();
        auto activeOutputChannels = device->getActiveOutputChannels();

        auto maxInputChannels  = activeInputChannels.countNumberOfSetBits();
        auto maxOutputChannels = activeOutputChannels.countNumberOfSetBits();

        for (auto channel = 0; channel < maxOutputChannels; ++channel)
        {
            if ((! activeOutputChannels[channel]) || maxInputChannels == 0)
            {
                bufferToFill.buffer->clear (channel, bufferToFill.startSample, bufferToFill.numSamples);
            }
            else
            {
                auto actualInputChannel = channel % maxInputChannels;

                if (! activeInputChannels[channel])
                {
                    bufferToFill.buffer->clear (channel, bufferToFill.startSample, bufferToFill.numSamples);
                }
                else
                {
                    auto* inBuffer  = bufferToFill.buffer->getReadPointer  (actualInputChannel,
                                                                            bufferToFill.startSample);
                    auto* outBuffer = bufferToFill.buffer->getWritePointer (channel, bufferToFill.startSample);

                    for (auto sample = 0; sample < bufferToFill.numSamples; ++sample)
                        outBuffer[sample] = inBuffer[sample] * random.nextFloat() * 0.25f;
                }
            }
        }
    }

Is this how it is supposed to work, or just poorly written code? I would expect the inputs to be passed to the outputs…