This is a simple program that uses the portaudio library to get audio from the microphone and play it back in real time after changing it's volume and pitch. It is a simple example of how to use the portaudio library with soundtouch library.

Requirements:

• Portaudio library
• SoundTouch library

Setting up compiler in Windows:

• Download and install MSYS2 from https://www.msys2.org/
• Install C++ compiler by running the following command in the MSYS2 UCRT64 terminal:

pacman -S mingw-w64-ucrt-x86_64-gcc

• Install portaudio library by running the following command in the MSYS2 UCRT64 terminal:

pacman -S mingw-w64-ucrt-x86_64-portaudio

• Install SoundTouch library by running the following command in the MSYS2 UCRT64 terminal:

pacman -S mingw-w64-ucrt-x86_64-soundtouch

• Run the following command in the MSYS2 UCRT64 terminal to compile the program:

g++ audio.cpp -o audio.exe -lportaudio -lsoundtouch

You may also have to include some DLL files in the same folder as the executable. You can find them in the C:\msys64\ucrt64\bin folder. Copy the following files to the same folder as the executable:

• libgcc_s_seh-1.dll
• libportaudio.dll
• libSoundTouch-1.dll
• libstdc++-6.dll
• libwinpthread-1.dll

Note: You may want to add the bin folder of the ucrt64 toolchain to environment variable PATH to compile and run the program from anywhere. Which in my case was: C:\msys64\ucrt64\bin