If I recall the discussions we'd had (at some length) when writing Spectrum, the original intent of the BEEP vs BUZZ vs SNAP/BANG rule was for the Accelerant traps to retain the use of the commonly available, white rectangular buzzers found at Radio Shack and similar places. They make a metallic buzz, as opposed to a smoother electronic tone as is commonly available from the piezoelectric elements also found at the Shack. Electronic doorbells and personal alarms, in my mind, fall into the latter category.

Edit: I just thought of a good verbal example - the sound made when someone got a question wrong on a game show, or guessed a thing not on the Board in Family Feud - that's a Buzz.

More complicated trap sounds should be looked at case-by-case.

Todd covered it pretty much.

Accelerant traps are either Snap Traps - various forms of mousetrap & click-traps,
or Buzz Traps - made by the harsh buzzer noise of an electric buzzer.

Assorted doorbell chimes, the more electonic sounding buzzers, and any recorded style
of audible warning would work as Spectrum reps.

-Chris