I would like to make a composition similar to that I made with quartz composer here:
(ableton enable the sprites via midi out (notes on/off > sprite on/off)
I make this with vuo: Vuo Midi test
but i have two questions:
1) for enabling/disabling the square, i used a workaround scaling to 0 (isnoteon > convert to integer > scale).
what are other ways of doing the same thing?
2) in my example all notes trigger a single square.
how to extract the notes in order to associate a single note to a single square?
1) You could connect the "Make 3d Object" to a "Select Input" with the other option being empty. This will work, but I'm not sure if it's somehow bad practice to feed an empty object to the renderer. Probably ok though. You could use the select input in other ways too to get the same result.
2) You can use the "Are Equal" to check the note. You would probably need to add a bit more logic to get this fully working like you want to, but this would be the start. See the picture:
As @mnstri said, using
Select Input to toggle between the presence and absence of an object is a good practice.
If you'd only like to respond to certain MIDI notes, you could use the
Filter MIDI Note node — that node will only pass the MIDI note events that match the criteria you specify.