Unable to use Personal Voice in background playback

Hi,

When attempting to use the my Personal Voice with AVSpeechSythesizer with application in background I receive the below message:

> Cannot use AVSpeechSynthesizerBufferCallback with Personal Voices, defaulting to output channel.

Other voices can be used without issue. Is this a published limitation of Personal Voice within applications, i.e. no background playback?

I'm seeing the same thing when trying to output speech to a buffer via writeUtterance:toBufferCallback.

Unable to use Personal Voice in background playback
 
 
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