The public beta of Serato DJ Pro 3.0 has been the most popular in the company’s history, and that’s for one reason, Stems. As it comes out of beta and becomes a full release, Rane has announced the first hardware with dedicated controls for Serato Stems, the Rane 4. The device has sparked controversy following teasers and leaks, and on this episode of Beatsource Tech, Mojaxx gives us a hands-on first look at how it works.