Representatives of the Pacific Symphony’s musicians and board signed a three-year contract Tuesday giving veteran orchestra members lifetime job security and an increased decision-making role, in exchange for minimal wage increases. Members of Local 7 ratified the contract Monday night by a 41-10 vote, with 34 members not voting, according to local president Douglas Sawtelle. According to the new formula, members of the Orange County orchestra are guaranteed a minimum of $5,215 this season for 81 performances and rehearsals, which does not include the summer season. The contract provides $75 per performance, $55 per rehearsal. Members can make up to $14,100 a year. Management also allowed evening rehearsals, giving the members freedom to continue teaching and doing studio session work.