PXT Sound Effects

This extension adds blocks for creating sound effects based on the music.playInstructions() interface.

It was originally intended for new waveforms (tunable noise, and cycle noise modulated square waves) that are currently only available in the beta editor, but also works with the current MakeCode Arcade editor as long as you stick to the waveforms it supports.

Example:

let soundeffect: SoundBuffer = null

soundeffect = soundEffects.createSound(WaveType.Triangle, 1000, 440, 110)
soundeffect.playUntilDone()

The parameters to createSound are:

• waveform
• duration in milliseconds
• starting frequency in Hz (cycles/second)
• ending frequency in Hz
• starting volume 0-1023 (optional, default 255)
• ending volume 0-1023 (optional, default 0)

Once the sound effect is created, use playUntilDone() or play() to play the sound, depending on if you want your program to wait for the sound to finish, or to continue running while it plays in the background.

You can modify the parameters of a sound effect using attributes, for example setting soundeffect.freq1 = 220.

Create a project with this extension

This repository can be added as an extension in MakeCode.

• open https://arcade.makecode.com/
• click on New Project
• click on Extensions under the gearwheel menu
• search for https://github.com/klausw3/pxt-sound-effects and import

Edit this project

To edit this repository in MakeCode.

• open https://arcade.makecode.com/
• click on Import then click on Import URL
• paste https://github.com/klausw3/pxt-sound-effects and click import

Blocks example

Example for basic effects: https://arcade.makecode.com/16695-67870-01625-09215

Link to the beta editor for trying the new waveforms: https://arcade.makecode.com/beta#pub:_JL6P9m5fYg9u

Metadata (used for search, rendering)

• for PXT/arcade

<script src="https://makecode.com/gh-pages-embed.js"></script><script>makeCodeRender("{{ site.makecode.home_url }}", "{{ site.github.owner_name }}/{{ site.github.repository_name }}");</script>