Don't label them "Auto" powers, people would generally not want to hide when they go off better yet have them play a visual effect that let's you know that your being boosted up no sound or rooting animation neccesary
Posted
the little boost up icon that pops up when it activates is a visual icon ( although a very small and if not paying attention to it easy to miss)
i do support adding in small visual/sound effects for the bonus build up (maybe akin to regular build up)
Don't label them "Auto" powers, people would generally not want to hide when they go off better yet have them play a visual effect that let's you know that your being boosted up no sound or rooting animation neccesary