I worked in C++ not only with Unreal Engine but also directly in audio development, using the JUCE library in the development of audio plugins. Adittionally I've develop instrument patches in Max MSP.
Lossify - Audio Plugin - C++ JUCE
I developed an audio plugin called Lossify, that emulates the artifacts of early 00's mp3 compression. The project includes custom components like delaylines for spectral smearing.
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You can check the code in detail in the following Git repository:
I developed a motion-based MIDI controller using the Leap Motion sensor and Max MSP. The controls are mapped to CC messages and MPE parameters to control virtually any hardware or virtual instrument.
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Perc Synth - Max MSP
Max patch that recieves the input signal of a piezo mic for the amplitude and envelop to synthesis sounds like a cajon.