By Greg Roumeliotis (Reuters) - Donerail Group, an investment firm led by former activist hedge fund Starboard Value LP executive Will Wyatt, has amassed a stake in Turtle Beach Corp and is pushing the maker of gaming headsets to explore a sale, people familiar with the matter said on Friday. The move represents a bet that Turtle Beach could attract acquisition interest from peers such as Corsair Gaming Inc and GN Store Nord A/S, as the video game market continues to benefit from people looking for entertainment options at home during the COVID-19 pandemic