Not all recordings are made the same, and they can be changed when a new stop or schedule comes along. On the Market-Frankford Line, SEPTA has a contract for announcements with Philadelphia-based Baker Sound Studios, while the Silverliner V Regional Rail trains feature a synthesized voice via text-to-speech technology, said Heather Redfern, a SEPTA spokesperson. Announcements made aboard other Regional Rail trains are by SEPTA employees themselves. P.A. announcements at Regional Rail stations are also made by SEPTA staffers.