Yeah there's definitely an Aussie twang in that voice, but it doesn't sound quite proper Australian either. So I had to look into it - caller is supposedly a Robert Geller, born in England but raised in Melbourne, Australia from a young age. Started his career here then moved on to Hong Kong, Seattle and now Toronto. So there you go!
@Aussie Bruin
I love the horses and have always been a fan of the race callers
For years Suffolk Downs in Boston had a caller and you always knew who he had bet on
Jim Hannon retired and was replaced at Suffolk by this announcer
Larry Collmus is now the caller of the Triple Crown and Breeders Cup on NBC but his greatest call happened 10 years ago in New Jersey