from the help files:
Setup
If you have never used a sound program with AH II before, you'll first need to setup and test your microphone. A microphone will be necessary for recording voice data that is transmitted to other players.
1) In the sound mixer controls (usually a speaker icon in your taskbar), begin by selecting the microphone as your recording device. Make sure the microphone playback is muted and boost is selected if it's present.
2) Test the microphone and playback in your standard Windows .wav recorder. Look under Start->Programs->Accessories->Entertainment->Sound Recorder for the testing application.
Once your mic and playback are working correctly, test the voice communications in Aces High II. Go online and tune the voice channel to yourself (".radio 5 YourGameID"). Press the transmit key (default is "T") and speak. You should hear a beep followed by whatever you said. If you don't hear the beep or your voice, and you are sure that you have configured your sound mixer controls correctly, contact HTC at
support@hitechcreations.com and we'll help you get started.
Voice Options
When online, click Setup->Preferences->Voice to access the options for voice communication in Aces High II.
Checking Use Wave In allows you to use the Windows API instead of DirectX for recording.
Checking Enable Range Channel Beeps or Enable Tunable Channel Beeps will begin each voice transmission received with an audible beep.
The microphone volume and play volume can be adjusted to whatever suites the player.
The Effect Volume can be set to dampen all other sound effects when you are hearing a voice transmission.
Do this, if it doesn't work, post back here. We'll get ya going
RTR