Most pagers would beep several times when they received the tones, usually for a second or so during the B tone. If someone was using an 8-second tone the pager would usually decode and unmute after about 4 seconds, which meant you got 3-4 seconds of the pager beeping madly (quickly followed by someone in the house throwing a shoe or something at the pager).
Most of the fancy post-alert noises (fast siren, slow siren, steady tone and high-low warble) would have been from Plectron tone boxes or Zetron consoles and tone boxes; they appealed to volunteers who were dependent on pagers and liked having a unique noise to tell different call types apart so they knew if they had to go or not.
All I recall Motorola boxes doing was the paging tones and that's it; any post-alert tones came from the dispatch console if there was one.
Up through the Motorola Centracom 1 console all you had was the steady tone, which could also be used as a beep tone by pressing the button repeatedly. The Centracom 2 and later (Gold Elite and MCC series) introduced the pre-set steady, high-low and beep tones. Zetron had a number of unique tones of their own and recreated the Plectron tones as well as the Motorola tones in their consoles and tone boxes; they use them to this day although in the Zetron Max consoles they're just WAV files sampled by the console when the proper "button" on the screen is pressed. They can also be "attached" to an alert pre-program to send a desired noise to a specific agency.
I kind of miss all those neat noises when they go away. I've maintained, dispatched from or been dispatched by all of these consoles and boxes over the many years I've been in this line of work. One of our current fire chiefs really hates the slow siren/warble tone, so I'm tempted to slap that alert on their console pre-program just to make his life a bit more surreal.
Check this page all the way at the bottom for samples of most of the noises these consoles and paging boxes made.