Same place. Right click the speaker ICON in the task bar, and select "Properties". Or go to the Control Panel and open the "Sounds" ICON.
NOTE: It may not be named as I noted above, but that should give you the general idea.
Windows, by default, will not set the microphone as the recording device. If you do not set it, then voice cannot work in Aces High.
Also note, applications can and will change the recording device, without your knowledge. So if voice stops again, check that control panel.