Update: I can confirm the behavior with one core voices as well.
Update on my Eloquence NVDA addon issue from yesterday. I originally stated I could not get synthesizer settings like rate and volume to properly work between configuration profiles. Here are the steps to reproduce it. May not work for you, but... here we go.
You will need multiple soundcards for this to trigger.
1. Set your synth to Eloquence.
2. Make a secondary profile.
3. Set that secondary profile to another audio card.
4. set all your speech rate settings.
5. Switch back to your normal profile.
6. Speech rate settings will not follow.
They will follow just fine if the audio device isn't switched.
this is so strange.