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Pro Audio Reserve proudly carries Whitestone Audio Instruments, founded by Dave Rosen and multi-Grammy nominated mastering engineer Kim Rosen. Drawing from years of high-level mastering experience, the Rosens recognized that some of the most musical enhancement comes from the gain stages of classic processors—not just their EQ or compression circuits. Whitestone designs capture this philosophy, delivering tube amplification that adds subtle harmonic depth and three-dimensional presence without obscuring your original sound. With fully switched, repeatable controls and carefully crafted non-linearities, each Whitestone unit brings the kind of analog "magic" that mastering engineers have relied on for decades, now accessible in your tracking and mixing chain.