Unfortunately I did not have any success with this at all. I've tried with Carillon v1.0b, v1.1b and v1.2b but with no luck. The chime sound plays fine from Terminal, but unfortunately not on boot. I also have changed permission for Carillon but still with the same result. Others who have gotten it to work on Yosemite 10.10.2? The other method mentioned in this thread is not very interesting, because the chime first play after you have logged in.