The Roland SP-404 Sampling Workstation is a discontinued sampler made by Roland Corporation. Released in 2005, it is part of the SP family and successor to where Boss Corporation’s SP-505 sampler left off. The sampler was succeeded by the SP-555 in 2008, but was later given its own upgrade as the Roland SP-404SX Linear Wave Sampler in 2009. Another upgrade, the Roland SP-404A Linear Wave Sampler was released in 2017. A third upgrade, the SP-404MKII was released in 2021. The Roland SP-404 has played a huge role in influencing the sound of popular music genre Lo-Fi Beats.

The Boss Dr. Sample SP-303 is a discontinued digital sampler from Boss, successor of the Boss SP-202 Dr. Sample. The SP-303 was revamped and redesigned in 2005, and released as the SP-404, by Roland Corporation.