Panasonic hold music comes from an external source (if it's programmed properly) that connects to the EXT MUSIC port of the KSU. A 7730 phone is an analog device, most likely plugged into a TA series box in the back room. Depending on how it's mounted, the jacks are under the cover on the top or the right side of the box. There will be 11 modular jacks on the base cabinet (3 lines 8 exts) a page port and the music port (both 1/8" jacks).
Wherever that cable goes is your music source.
Carl
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