Hm I don't quite understand you... You want another announcer welcoming you to the track?
I don't think we should add too many different voices. After all it is a racing game. You already have Charlie describing the track [and teams later on] as well as Blocky for in-race commentary. Also don't forget that there is Carlos aswell and he won't only appear on the tutorial.
Next is on tracks like Nazca Remains, there is no crowd, and also no other announcement system. Even the Blocky countdown screen is nothing very professional, but a short and rusty solution to have the official mascot [Blocky] in the desert...