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.
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.
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.