Transistor's story revolves around a talking sword that glows and pulses as it speaks to the game's protagonist. Supergiant was able to sync the DualShock 4's light bar with the sword's in-game behavior, aiding player immersion.
"When Sony revealed the controller, they suggested this light bar could have a variety of uses, such as visually distinguishing between four players in a cooperative game and stuff like that," Kasavin explains. "Sony didn't suggest it could be used to indicate when an extraordinary weapon of unknown origin was speaking to you.
"We soon found, however, that the light bar works really well for that. We got it to match the exact turquoise hue of the in-game weapon, and the flashing effect was in perfect sync. When I played with this for the first time, it felt a little more like the Transistor was right there in my own hands."
"The controller has a speaker on it, too," Kasavin adds. "We're looking into that."