When a note button is pressed, the button should fade in from the default brightness to full brightness and hold that as long as the button is pressed. When the button is released, the button should fade back to the default brightness. If a button hasn't reached full brightness before being released, it should start to fade out. Similarly, if a button is fading out and is pressed again, it should start fading in.
When a note button is pressed, the button should fade in from the default brightness to full brightness and hold that as long as the button is pressed. When the button is released, the button should fade back to the default brightness. If a button hasn't reached full brightness before being released, it should start to fade out. Similarly, if a button is fading out and is pressed again, it should start fading in.