My goal is to create an application, that is able to alter or mix a data coming from microphone before it will be processed by a target software (audio recording software, Zoom, Discord etc.). Ideally, I’d like to avoid any kind of virtual microphones or custom made audio drivers. I think, WASAPI is the thing I’m looking for, however I can’t find information of how to mix data into existing input datastream. An alternative is to replace that datastream, but I’d like to achieve it with mixing. It’s easy to play a sound as the mixer does mixing for you implicitly, and I’m wondering if it’s possible to do the same for input