How to play sounds into the microphone by pressing the keys?

Question

Audio

Hello, how to play sounds by pressing a certain key, for example Num1 (Sound # 1) Num2 (Sound # 2) and so on

Answer 1

Sounds are not reproduced in the microphone, but in the loudspeaker.
Handling keystrokes - depending on the components for building the UI (see Delphi, Visual Studio, ...).
In general, the search keyword is: MIDI .
Of the libraries, there are many different ones: NAudio, PortAudio, ...
This topic is called "Digital Signal Processing" and, in particular, "Digital Audio Processing".
In the simplest case, you can synthesize sound using the beep function.