Pittsburgh’s WQED Multimedia has begun generating revenue by originating high-def satellite teleconferences and musical performances beamed to specially equipped suites in 67 Morton’s Steakhouses around the country, to be demonstrated in a live news conference this afternoon. Velocity Broadcasting — a division of Elias/Savion Inc., Morton’s ad agency — is offering the “precision marketing” service to businesses as well as closed-circuit entertainment events in the Higher Definition Private Performance Series, which launched in October with a concert by trumpeter Wynton Marsalis, also originated by WQED.