SDL_mixer | audio mixer that supports various file formats | Audio Utils library

There are a lot of libraries' packages which do not provide a CMake config file, and in order to find and use them with cmake, one would have to resort to using a FindPackage.cmake script. Some scripts (i.e. SDL) are available within the cmake itself, so finding a package is relatively easy.
Though in my case, SDL-searching scripts (SDL, SDL_image, SDL_mixer) are available almost since the dawn of modern cmake (at least 3.1), they do not provide the means for the modern approach - they do not define imported cmake Targets. SDL as a target is available only since 3.19, and it does not define IMPORTED_LOCATION property.
So, the logical thing is to define those targets and properties.
A naive approach would possibly be to just copy the contents of FindSDL.cmake from a newer cmake bundle and paste it with modifications.
But I would like to keep those files from a cmake bundle (or another good enough script from external source) intact and just wrap them.
So, the main CMakeLists.txt would be like:

When running the code import pygame.mixer (or anything else that refers to pygame.mixer) on a 2021 M1 MacBook Air after running the command python3, I receive the error ModuleNotFoundError: No module named 'pygame.mixer'.

What I've tried: reinstalling sdl_mixer, reinstalling sdl2_mixer after editing as per https://github.com/veandco/go-sdl2/issues/299#issuecomment-611681191, reinstalling Pygame after doing that, running the installation of Python at /usr/bin/python3 and trying the command there, and removing and reinstalling sdl2_mixer normally.

I'm writing some simple test audio code to make sure SDL_mixer works for my application, but in the code to change the volume when given certain characters from std::cin everything works except for subtracting 10 from the volume. Adding 10 works, subtracting 1 works, but subtracting 10 only subtracts 1 and not 10.

In the code below, the variable sound is a struct containing 2 maps called mus and eff, indexed by strings and containing Mix_Music* and Mix_Chunk variables respectively. "Moon Patrol" is my music audio and "Pew" is my test effect audio. Also, sorry about the big if/else statement, I'm going to be using GLUT keys for input in the actual program.

Relevant Code:

I'm making some SDL2 wrappers in C++. Like this:

Command "python setup.py egg_info" failed with error code 1 in C:\Users\Eli Heist\AppData\Local\Temp\pip-install-fjf50xi9\pygame\

this is the full process

I am trying to create an interface for my program using SDL2. The problem is that when I include my .h file, the compiler can't find the .cpp even tough I linked everything. None of the methods I found on the internet work and when compiling in visual studio, the code works perfectly fine. What is more strange is that when I try to make my classes inherit from others, I get the same error from the parent class. I am also using the latest version of Ubuntu. Furthermore, I installed all the libraries required for SDL2. This is the error:

I've been working on my own lib for 3D audio using SDL2_Mixer and DSPFilters by Vinne Falco. Currently i'm at the stage where i need to create custom DSP to filter audio, while SDL_mixer takes care of the registering of the effects, the actual DSP is proving difficult.

SDL provides:

I've coded a simple sequencer in C with SDL 1.2 and SDL_mixer(to play .wav file). It works well and I want to add some audio synthesis to this program. I've look up the and I found this sinewave code using SDL2(https://github.com/lundstroem/synth-samples-sdl2/blob/master/src/synth_samples_sdl2_2.c)

Here's how the sinewave is coded in the program:

I'm trying to use sdl on ubuntu. According to this instruction(https://gist.github.com/BoredBored/3187339a99f7786c25075d4d9c80fad5) i installed sdl2, sdl image and sdl mixer. Now I have to link them while building. Example how should I do it below.