Ok, I explain more in detail.
When I create a new event having Google Calendar as default, it doesn't even offer me the option to set a sound/music alarm. The new event window will offer an alarm button with two options, alarm by sms and by email, but not sound alarm at all.
If I change and choose the default calendar, the sound alarm is there and works, but then I have no Google Calendar syncronization.
I might be doing something wrong, but that is what I get.
Thanks. (Remember I am talking of the last beta)