MRCPSynth() Change Voice

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Hello,

I’m trying to change the voice during a spoken text:

exten => _X.,1,Answer exten => _X.,n,MRCPSynth(“Hello, my name is Daniel. I have a Dutch companion. ###\voice=Xander\ Hallo, mijn naam is Xander.”,p=default&l=en-GB)
exten => _X.,n,Verbose(1, ${SYNTHSTATUS})
exten => _X.,n,Hangup

This exact same text, with escape sequence, works perfectly in the demo environment for Nuance Vocalizer.

I also tried a SSML markup instead of plain text. That didn’t work either.

Any ideas?

Regards,

Grant