I'd like to know if i could add sounds like claps, trumpets, etc that i foun on ther pages to hammer; and if it's posible how?

You can make your own sound-bank.

In the HH folder is a file called
MAKEBANK.exe Run that, import your own
samples, then save the bank (a ".HUB"
file).

In Hammerhead as the User bank load
relevant .HUB file.

Very easy. You'll see what I mean. Can't
go wrong really...