You can just call another job that adjusts the SAPI voice element. CScript refers to the VBScript so it's probably easier to save the SAPI object OR the PID of the VBScript process.
Can you give me an example of what you mean?
I mean, you can search this kind of thing up online. There's quite a bit of examples on Stack Overflow, and you can just piece them all together. If I just gave you the code, then you wouldn't be learning anything.