I've never had a very quiet voice. I tried in choir to make it smaller and it just didn't work out. And I listened to a lot of soul music when I was growing up on my own accord. But I was mostly into Mama Cass and Gladys Knight and they all had big voices too just different than mine.
The big thing is hydrating the day before the race. I will have 20 ounces of water right when I get up in the morning the day before and I'll drink throughout the day.