Voice Pronunciations

Hi

I'm currently using version 6.20 and have loaded the voices that came on the DVD.  Unfortunately some of the pronunciation is bit of a spoiler for an otherwise great program, for instance glid-er-path for glidepath, run-u-way and wind (as in wind up a clock).

If I purchase some of the more professional voices available like Ivona and Cepstral does this improve the pronunciation within VoxATC ?

Thanks, Glen