Having sound issues

and/or there's no sound effect playing
If I disable the function that plays sounds effect, the music works fine.

I am confused....is it ticking while the sound effect is playing now or not?

I'm still as confused as you because it's all pretty random but here's what seems to happen

If there were no sound effect playing before the music started and there's currently no sound effect playing: The music works fine
If there were no sound effect playing before the music started and there's currently sound effect playing: [impossible to know]
If there were sound effect playing before the music started and there's currently no sound effect playing: The music works is constantly ticking
If there were sound effect playing before the music started and there's currently sound effect playing: The music works is constantly ticking

Can you post me both the wav and your sound effect so that i can take a closer look?

No need to give you the music because I tryied with multiple other music from other games (including yours) and I still got the same problem. SFX:
const Gamebuino_Meta::Sound_FX BulletS[] = {
  {Gamebuino_Meta::Sound_FX_Wave::NOISE,0,136,-11,0,64,2},
};

Unfortunately i am not able to reproduce with any of my WAV files, so i have no idea what is going on :/

EDIT: this is the test sketch i used

#include <Gamebuino-Meta.h>
const Gamebuino_Meta::Sound_FX BulletS[] = {
    {Gamebuino_Meta::Sound_FX_Wave::NOISE,0,136,-11,0,64,2},
};

int8_t track = -1;
void setup() {
    gb.begin();
}

void loop() {
    while(!gb.update());
    
    if (gb.buttons.pressed(BUTTON_A)) {
        if (track == -1) {
            track = gb.sound.play("/reuben3/songs/home2.wav", true);
        } else {
            gb.sound.stop(track);
            track = -1;
        }
    }
    
    if (gb.buttons.pressed(BUTTON_B)) {
        gb.sound.fx(BulletS);
    }
}

try with #define SOUND_BUFFERSIZE 3072

Nope, doesn't make any difference. And if that had it would have heavily surprised me

20fps?

nah

I don't know what's the problem there

20fps?

Also tried

EDIT: did you think about that your wav file maybe just has some ticking in it?

I mentioned that the .wav sound works perfectly if I disabled the sound effect, I can't be the file

Soo... Has progress been made... maybe?
- When there's a too intense sound problem, I get an hard fault (Error 2)
- It looks like the sound and fx are sharing the same sound channels!

- When there's a too intense sound problem, I get an hard fault (Error 2)

That sounds like a completely unrelated issue, like you are running out of RAM or thelike

- It looks like the sound and fx are sharing the same sound channels!

They aren't. FX have their own buffer.

Ok then I'm stoopid

You can always look at the GitHub repo of the game if you have time (_02_Bitmap.ino, last lines)