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Sound looping problems - audio keeps glitching and restarting

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AF

AudioFixer_Jake

Posted on July 21, 2025 • Beginner

🔊 Sound Loop Glitching Issue

I’m getting really frustrated with Scratch! This is like my 100th audio problem. I’m trying to make a sound play in a continuous loop, but it keeps glitching out and sounds terrible. 😤

What I’m trying to do:

when green flag clicked
forever
  play sound [background music]
end

But it’s acting like this:

when green flag clicked
forever
  start sound [background music]
end

The sound keeps restarting every frame and creates this horrible glitchy noise. I tried using “play sound until done” but the sound still played a few times before glitching out completely.

What am I doing wrong? How do I make a smooth audio loop? 🎵

SM

SoundMaster_Lisa

Replied 15 minutes later • ⭐ Best Answer

I totally understand your frustration @AudioFixer_Jake! This is a super common audio issue in Scratch. Let me explain what’s happening and how to fix it:

🔍 Why This Happens

The problem occurs because Scratch runs at 30 frames per second, and your forever loop is trying to start the sound 30 times every second! This creates the glitchy, overlapping audio effect.

📊 Audio Timing Diagram

timeline title Sound Playback Issues section Wrong Way (play sound) Frame 1 : Sound starts Frame 2 : Sound starts again (overlap!) Frame 3 : Sound starts again (more overlap!) Frame 4 : Glitchy mess of overlapping sounds section Right Way (play sound until done) Frame 1 : Sound starts Frame 2-90 : Sound continues playing Frame 91 : Sound finishes, starts again Frame 92-181: Sound continues smoothly

✅ Solution 1: Use “play sound until done”

This is the most common solution:

    when flag clicked
forever
play sound [background music v] until done
end

This waits for the sound to finish completely before starting it again, creating a seamless loop.

✅ Solution 2: Check if sound is playing

For more control, you can check if the sound is already playing:

    when flag clicked
set [music playing v] to [false]
forever
if <not <(music playing) = [true]>> then
set [music playing v] to [true]
start sound [background music v]
wait until <not <(loudness) > [0]>>
set [music playing v] to [false]
end
end

✅ Solution 3: Use a dedicated music sprite

Create a separate sprite just for background music:

    // In Music Sprite
when flag clicked
forever
play sound [background music v] until done
end

when I receive [stop music v]
stop all sounds

when I receive [start music v]
// Music will start automatically from forever loop

✅ Solution 4: For seamless loops

If you want truly seamless loops without any gap:

    when flag clicked
start sound [background music v]
forever
wait ([length of sound v] - [0.1]) seconds
start sound [background music v]
end

Note: You’ll need to know the exact length of your sound file for this method.

🎯 Pro Tips for Audio

  • Use short, loopable audio files - easier to manage
  • Test your audio - make sure it loops smoothly
  • Consider file size - large audio files can slow down your project
  • Use appropriate volume levels - set volume before playing

🛠️ Debugging Audio Issues

If you’re still having problems:

  • Check if your sound file is corrupted
  • Try a different sound file
  • Make sure no other scripts are interfering
  • Test with a simple, short sound first

The “play sound until done” method should solve your glitching issue! 🎵

AF

AudioFixer_Jake

Replied 20 minutes later

@SoundMaster_Lisa OMG THANK YOU! 🎉

The “play sound until done” method worked perfectly! I had no idea that the forever loop was causing the sound to restart 30 times per second. That explains the horrible glitchy noise!

My background music is now playing smoothly without any interruptions. You’re a lifesaver! 🙏

AP

AudioPro_Marcus

Replied 1 hour later

Great solution @SoundMaster_Lisa! 👍

For anyone working with audio in games, here are some additional tips:

  • Layer your audio: Use separate sprites for background music, sound effects, and voice
  • Volume control: Add volume sliders for better user experience
  • Audio cues: Use sound to provide feedback for player actions
  • Performance: Avoid too many simultaneous sounds

Audio can really make or break a game experience! 🎮🔊

VB

Vibelf_Community

Pinned Message • Moderator

🚀 Master Audio Programming in Scratch!

Excellent discussion on audio loops and sound management! For those looking to create professional-quality audio experiences, our community can help with:

  • 🎵 Advanced audio programming techniques
  • 🔊 Multi-layered sound design
  • 🎮 Interactive audio systems
  • 🛠️ Audio optimization and performance

📚 Related Topics

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