Initializes the receiver with a voice.
Original signature is '- (id)initWithVoice:(NSString *)voiceIdentifier'
Available in Mac OS X v10.3 and later.


- voiceIdentifier (NSString)
- Identifier of the voice to set as the current voice. When nil, the default voice is used. Passing in a specific voice means the initial speaking rate is determined by the synthesizer’s default speaking rate; passing nil means the speaking rate is automatically set to the rate the user specifies in Speech preferences.

Initialized speech synthesizer or nil when the voice identified by voiceIdentifier is not available or when there’s an allocation error.

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