Explanation for Scratch 3 MIDI

This extension is for using a MIDI device like a MIDI Controller through Scratch3. It's made by Web MIDI API. This API is one of the HTML5 functions defined by W3C.

Application page is Web MIDI Scratch 3

Reference

• Web MIDI API Working Draft
• W3C

Preparation

Please Use Chrome. This extension is able to use only on Chrome. The other browsers are not supporting Web MIDI API now, April 2016. Do you know MIDI? MIDI is a protocol for connecting between MIDI Devices or a MIDI device to the PC. If you don't know, please see like a following page.

• MIDI wiki
• SUMMARY OF MIDI MESSAGES

Before you try to use these extensions, you should connect a MIDI device to your PC via USB. After you connect a MIDI device, you launch Chrome browser. Because Chrome browser finds the MIDI device when it launches.

Usage

• Open Scratch 3 Editor from here
• Push the under-left icon.

• Select Web MIDI Extension form Extension list

• You can find Web MIDI blocks under the block paret.

HAT Block

• indicates all midi event

• indicates note on event

• indicates note off event

• indicate pitch bend event

• indicate program change event

• indicate control change event

• indicates note on event with note number

reporter block

• Note Number

• Velocity

• Pitch Bend

• Control Change Value

• Program Number

Boolean reporter

• MIDI event

  • 'key on' --- key on event
  • 'key off' --- key off event
  • 'cc-chg' --- control change event
  • 'p-bend' --- pitchbend event
  • 'pg-chg' --- program change event

Note On Message

• 
  Genarates a MIDI NOTE ON message. The first parameter is a channel number, the second one is a note number and last one is a velocity. Normary the velocity is zero means note off.