Well. Today I took my HS back to dealer to have the horn fixed (second time). Was told that the button was faulty.
At the same time, I asked if there was anyrhing that could be done about the gay sounding horn!
Well, yep they offered me a PIAA horn system. I siad go ahead. This kit has 2 trumpets, one of which just fitted in the original horn position (together with a new relay), and the other trumpet I have had fitted just behind the evaporarive emissions cannister (which I wanted to remove, but dealer told me it would void my warranty).
Anyway, to cut a long story short, the horn now sounds like a frieght train! I'm almost nervous to press the button now, it is so loud! At least people will now I'm there!