speaker sound glitchy

[Yami_Industries]

my speaker sound is not glitchy in the menu only when using the  but its glitchy in gba games...

gameboy and gbc games sound and run fine...

can the pi zero even run gba? 

sound settings

system volume: 0

audio device: speaker 

enable navigation sounds: on 

enable video audio: on 

omx player audio device: both