Hornsound was recorded back in 2002 from T356.
I just finnished doing some changes to this (04-04-2009), use B to get the horn with a echo like your passing
through closed spaces or acades, I also split it up so you don't get the long blast of it when you use H or + button.
I have other tapes of hornsounds I'll put up when I find them all, I seemed to lost a few when I moved house last year.