The Roland/Boss Dr. Sample SP-303 is a digital sampler from Roland based upon the Roland MS-1 Digital Sampler & Boss SP-202 Dr. Sample. The SP-303 was in 2005 revamped and redesigned and released as the SP-404.
The SP-303 itself provides up to three minutes and twelve seconds of sampling. The sample time can be expanded by the use of SmartMedia cards (8MB-64MB supported). The SP-303 features twenty-six internal effects that can be applied to samples and external sources as well. It also has a built-in sequencer.
While the SP-303 Dr. Sample may lack some of the features seen on other hip hop production samplers such as the Ensoniq ASR-10 and the Akai MPC it also has many unique features. It has aided in the production of albums by artists such as Panda Bear[1], Four Tet[2], Madlib and Jay Dee[3]. The SP-303 has a pattern sequencer, where loops and patterns can be programmed. There is no real ability to multi track (with only one output on the sampler) but comes with a wide assortment of internal effects.
http://www.vintagesynth.com/roland/sp303.php
http://www.bosscorp.co.jp/products/en/SP-303/