How to stop horn going off when locking (4th gen)?

Hi all, just picked up my 98 Firebird from the dock today (shipped from Miami into Bristol, UK). Not got a user manual for it, and when you lock it using the remote the horn sounds twice. Not exactly subtle, and could annoy
neighbours late at night! Is there a way to stop it doing this? Sure I'll think of lots less-trivial questions over the next couple of weeks...
Cheers, Dan
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Lessee.... from the book; Turn the key on... turn the key off.... kills the alarm Pull the RADIO fuse then turn the key to ACC. Should chime twice I think Press the remote lock button and count the chimes. you'll probably hear 2 or 3 chimes. Cycle thru pressing the lock button getting 1 thru 4 chimes until you get what you want. 4 chimes flashes the parking lights (and fog lights if they're on) when locking. 1 chime doesn't do a thing when it locks up but it does lock.
Turn off the key and put the fuse back. Test it.

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