SONICblue today introduced its latest additions to the Rio line of portable digital music players, the Rio S50 and S35S sport player. Both players support MP3 and WMA formats, and offer 128MB of built in memory (upgradeable to 256MB), a backlit screen, a clock and stopwatch, an integrated FM tuner, and Mac and PC compatibility. The S50 also features a carrying case and a battery life of up to 35 hours. The S35S is targeted at athletes, and features a “rugged, durable shell,” and an adjustable armband. The Rio S50 (US$179.99) and Rio S35S ($199.99) will both be available “soon,” according to the press release.