Computer Music: Musc 216
Isadora Tutorials: All Notes Off
When you start programming Isadora to play notes there
is a possibility that you will turn a note ON and not be able to turn
it back off. Consequently, a note will continue to sound and you may
have to quit the application or even restart your computer. In this
tutorial you will implement a standard MIDI command to TURN OFF ALL
NOTES that are currently sounding when you press the SPACE BAR on your
FORMAT OF THE MIDI COMMAND
The command, ALL NOTES OFF is part of the CONTROL CHANGE family of
MIDI commands and has this format:
|$B0 - $BF
STEP 1: Open your Project2Controller file. [Download
the file HERE]
Open your Project2Controller which you completed in the
previous tutorial. If you did not complete the previous tutorial, please
do that now.
STEP 2: ADD A NEW SCENE; NAME THE SCENES
So far you have only one SCENE in your Project2Controller and it probably
looks something like this:
Create a NEW SCENE by doing this:
1. Place your cursor to the right of the Scene ICON, "Untitled"
at the bottom of the Isadora window. The Actors in the Play a Note
scene will disappear and your cursor will start blinking.
2. Under the SCENES pull down menu, select "Insert Scene."
You will see a new Scene ICON appear to the right of the previous
one and it will be labeled, "Untitled-1."
3. Option-click your cursor on the original scene ICON and change
the label to "Play Notes"
4. Change the label of the new scene ICON to "Ctl Changes"
You window should now look like this:
STEP 3: ADD THE ACTORS TO TURN OFF ALL NOTES when you press the
1. From the Mouse and Keyboard group of Actors add a new Keyboard
2. From the MIDI group of Actors add a Send Control Actor.
3. Set the parameters on each actor like this:
- In the Keyboard Watcher Actor key range parameter field
enter ' ' (single quote, SPACE, single quote).
- In the Send Control Actor change the "controller"
parameter value to 123. This is the "controller number"
for ALL NOTES OFF.
- Send Control Actor output to the Send Control Actor
Now, if you should get a "hung" note (a note that won't
turn off) all you have to do is press the SPACEBAR.
STEP 4: ADD A NEW SCENE which will activate ALL SCENES.
In Isadora, the Actors in a Scene only become active when the Scene
is SELECTED. Consequently, when you are in the Play Notes Scene
and a note should become "hung" you would have to click the
mouse on the Ctl Changes Scene for those Actors to function when
you press the SPACEBAR. This, of course, is very inconvenient. It would
be nice for ALL SCENES to be active all the time. To do this, you will
have to create a new scene called "Main" and place it to the
left of the "Play Notes" Scene. In addition, you will have
to add Actors in the new scene which tells Isadora to ACTIVATE ALL
SCENES. Do this:
1. Create a new scene to the left of the Play Notes Scene and name
2. Choose the "Control Group" of Actors (group #7) and
place an Enter Scene Trig Actor.
3. In addition, add TWO Activate Scene Actors.
4. Make the connections as shown below.
5. Change the Scene parameter field in one of the Activate
Scene Actors to "+2 Ctl Changes." You can do this by clicking
on the field and then DRAGGING the mouse up or down. Any Scenes which
you have created will automatically appear in this parameter field
and can be selected individually.
Your new "Main" Scene Actors should look like something
Your Main Scene window should look something like this:
STEP 5: Configure SimpleSynth to play notes from Isadora
See the previous tutorial for how to do this.
STEP 6: Try it out!
1. Click on the Main Scene ICON at the bottom of your window.
2. Press the 'a' key to play a note (leave it down).
3. Press the SPACEBAR and the note should turn off.
STEP 7: Troubleshooting (debugging)
1. If you do not hear any notes play, you will have to reconfigure
the MIDI setup with Simple Synth. See the previous tutorial.
2. If you still don't hear any sound, go to Isadora's MIDI Setup
window. In the DESTINATION port, change the selection to "None"
then change it BACK to "SimpleSynth virtual input."
3. If you still don't hear any sound, ask your Instructor for assistance.
STEP 9: Save your work
When you complete this tutorial:
1. Save your Isadora file. You will want to keep the OLD Project2Controller
file you created in the last tutuoral. So you can either RENAME that
file as something like Project2Controller.OLD, or you can name
this new file something like Project2Controller.CURRENT. Which
ever you decide to do, you should always keep the copies of your older
tutorial files in case you "mess up" and have to start over
2. Save another copy of this file and call it Homework10.YourLastName.
See the Class Schedule
for specific details about submitting this Homework
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