First I should apologise for forgetting my manners the other day - Happy New Year .
I've done some more testing and find that the first use of RRVoice_On requires very accurate pronounciation, whereas subsequent uses appear to allow much less accurate pronounciation which may be as much to do with the mic and training profile as anything else - so my bad with that.
The .NET Framework error message I'm getting with the DFXVoice utility reads:
'Undefined Exception has occured in your application. If you click Continue the application will ignore the error and attempt to continue. If you click Quit the application will close immeadiately.
Object reference not set to an instance of an object'
I suspect this is related to my set up as its not being experienced elsewhere. However any advice would be welcome.
This app is working very well in general, a fitting tribute to the hard work and dedication from yourself and associated developers.