IBM 6112884 + Hasu's converter is not unreasonably priced and has an infinitely adjustable beep. It can go all the way from "Barely Audible" to "Uncomfortably Loud". Actually you can turn it down so much that it's off. There's no detent or anything, but it`s off just the same. I've got one of those Zeniths, though, and it is indeed nice. The procedure to turn the clicker on and off is really arcane, though, it's something like "Hold two specific keys while the machine boots", IIRC, and there's no volume knob for it, it's the volume it is. I suppose you could resort to 19th century techniques to quiet it (The expression "Put a sock in it" came from the common method of quieting a gramaphone player without an actual volume control of some kind; stuff a sock in the horn) but I don't know if you could make it louder if you wanted it.