Slate Pro Audio Slate Pro Audio is a company owned by Yellow Matter Entertainment, and focuses on a number of DSP products and audio hardware products. They are best known for their Raven MTi touch display audio production console. Average User Rating 0 0 votes Please sign in to rate. Your Rating 0 Contact Phone Number: +1 (323) 656-2050 Address: Los Angeles, California U.S.A Email: sales@stevenslate.com Online: History History coming soon!