Problems with the music player

[Anke]

@Fran914293

but when every time it is played, it leaves a thousandth of a second without music

The Player component cannot loop seamlessly. You need to use the TaifunPlayer and the OGG format, because it's the only compressed audio format that is loop-able (without gaps).

App Inventor Extensions: Audio Player | Pura Vida Apps

Note: MP3 is basically not loopable.