I've wanted this as well.
dhn, what he menas is that he/we would like the TomTom to use a recorded voice to say the first half of the instruction, and the the computer voice ONLY say the street name. In other words, using a combination of both voices. UK Kate sounds like she's yelling at me, and I love UK Jane's recorded voice. I wish I could use a combination of both.
I wish they had Jane as a computer voice. I like the UK accent, but I don't like Kate since she's yelling at me

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Suicidal TomTom GO 720
8GB Sandisk Extreme III SDHC card
NavCore 8.410
Map - North America v845 and Europe v835
Brand new battery installed
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Tampa, FL - USA