may, 2017 St. John's Episcopal ChurchBrooklyn, NY sun07mayAll DaySandbox Percussion performs Synthetic TwinBrooklyn, NYPiece:Synthetic Twin for percussion quartet Event DetailsSandbox Percussion will be performing Peck’s quartet Synthetic Twin on the “Concerts on the Slope” series in Brooklyn, NY on May 7th. Event Details Sandbox Percussion will be performing Peck’s quartet Synthetic Twin on the “Concerts on the Slope” series in Brooklyn, NY on May 7th.