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Here's a LabSound Hello World. It plays A440 for one second.

    int main()
    {
        auto context = lab::MakeRealtimeAudioContext();
        auto oscillator = std::make_shared<OscillatorNode>(context->sampleRate());
        auto gain = std::make_shared<GainNode>();
        gain->gain()->setValue(0.0625f);

        // osc -> gain -> destination
        context->connect(gain, oscillator, 0, 0);
        context->connect(context->destination(), gain, 0, 0);

        oscillator->frequency()->setValue(440.f);
        oscillator->setType(OscillatorType::SINE);
        oscillator->start(0.0f);
        std::this_thread::sleep_for(std::chrono::seconds(1));
        return 0;
    }