Sets the receiver’s current voice.
Original signature is '- (BOOL)setVoice:(NSString *)voiceIdentifier'
Available in Mac OS X v10.3 and later.


- voiceIdentifier (NSString)
- Identifier of the voice to set at the receiver’s current voice. When nil, the receiver sets the default voice as its current voice.

YES when the receiver is not currently synthesizing speech and the current voice is set successfully, NO otherwise.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)