Contract negotiations with the musicians of the cash-strapped New Jersey Symphony are set to go into overtime tonight, when the current collective bargaining agreement expires. Both sides say negotiations are proceeding amicably, and there is no risk of a strike or a lockout. The NJSO musicians accepted a temporary pay cut in 2003, and are hoping to maintain their current salary of $44,975 under the new deal, even as they accept a role in bringing the organization back to fiscal stability.