I have the voice system fully operational now. The menus and setting screen offers a new option to make Voice Settings. A new form pops up with several settings available.
Ideal Flight Voice has the the ability to change audio outputs to whichever sound channels you have so that you need not mixdown the voice into the P3D or FSX sounds, which is also an option.
In my tests I'm running the simulator on the main 2.1 speaker system, and outputting the IF Voice into a monitor. Does the same with headphones and so on.
IF Voice can use whichever SAPI voices are installed, usually three or more with Windows 10. The volume and speaking rate are also adjustable.
The Dell 43" multi-input monitor has hdmi attached internal speakers, and is connected to a Humanscale suspension arm. This is perfect for testing multi-channel sounds, has the best adjustable location available, and is awesome for coding:
At the moment Ideal Flight Voice speaks out all the IF messages in the simulation. I may be able to upload the first preview over the next week or so, but it cannot be rushed. System sound integration is a complicated process and requires plenty of testing.
Please note that IF Voice installs only with P3D v4 and Special Edition versions of Ideal Flight.