I Can’t Hear You! Sound Get out your notes. Today we are going to learn about sound and specifically the type of sound files that Scratch will accept. Sound files can be large and , like images in the previous lesson, sometimes they have to be compressed to make them smaller and easier to store or transmit. Get out your notes. Module 4- Build a Game

Sound formats in Scratch Scratch can read MP3 files and uncompressed WAV, AIF, and AU files. Just like images, sounds can also be compressed to make them smaller in size. MP3 files are an example of this. Scratch can read MP3 files, which are compressed audio files (more about this in a moment). Scratch can also read uncompressed WAV, AIF and AU files. You must make sure that your sound files are in one of these formats, before importing them into Scratch. As you can see, just like images in the previous lesson, sound files can also be compressed to make them smaller in size. MP3 files are an example of this.

So what’s it all about?... Uncompressed sound files: AIF files Gold standard of audio files, Highest-of-high-quality uncompressed audio that you can save on a disc. AIF files sound great, but files are huge. WAV file, or waveform audio file Known as simply .wav after its extension. A common type of sound file. Can also be quite large. AU file An audio file typically created on a Sun Microsystems or Unix-based machine. Not that common and quite large. The following are uncompressed sound files and can be quite large. AIF files are the highest of quality uncompressed audio but they are very large files. WAV files or waveform audio files are common files but can also be quite large. AU files are not that common and are also uncompressed so they are large files.

Compressed sounds - MP3… MP3 files contain music and other audio. They are popular because they compress music down to a very small size while maintaining quality. Files are small, making MP3s ideal for iPods and for the internet. MP3 files are compressed audio files. These files contain music and other audio streams. They are very popular because they compress music down to a very small size, while still maintaining good quality sound. MP3 files are ideal for iPods and the internet because they are small.

Including Sounds into Your Game 2) Select the ‘Sounds’ tab. 1) Select the sprite or background you want to tie to the sound 3) Click on ‘Choose a sound’, navigate to find your sound and select it.

Select a Sound Put the mouse over the sound to hear a sample. Click on sound to add it to your sounds.

Code to put sound into your game. Start Sound to play the sound. You can use other sound effects to modify the sound.

Importing (School Appropriate) Sounds Go to the website http://www.pacdv.com/sounds. All sounds are in mp3 or wav formats suitable for use in Scratch. To download the sound, right click on it and select ‘save link as’ then navigate to your intro to programming folder and save it there. Choose a sound effect you would like to add to your project in Scratch. We are now going to download some audio files in mp3 / wav formats from a website that has free sounds and music. We will now go to the website http://www.pacdv.com/sounds and choose a sound effect you would like to add to your project in Scratch. I will explain how to save the file onto your computer and import it into Scratch. Remember Scratch accepts both mp3 and wav sound file formats.

Saving Sounds from the Internet Navigate to your Intro to Programming folder to save the sounds.

Adding Sounds to Your Game Incorporate at least three school appropriate sounds into your game Turn it in as YourNameMod4Lesson3Sounds