I am wondering if there is a name for an effect I hear in a certain electronic song.
Here is the song: https://www.youtube.com/watch?v=9wNXRkmgd9w&t=180s. (It will automatically load at the time where the effect takes place.)
I am referring to the way that the synth gradually "opens up" / "hollows out" / "yawns" (while also growing louder) over the course of about 30 seconds. I'm thinking it's an instrument-specific property that probably changes based on the velocity of the note. If I'm right, is there a name for the type of instrument that changes texture based on velocity like this?
I ask because I find this effect to be absolutely stunning and would love to learn more about it, so in lieu of a name any hints about what I should Google would be highly appreciated :)