Use Ventrilo 3.0.8 for Windows 7 64bit.
In settings under Voice, have Outgoing voice communication enabled
Have Use DirectSound boxes checked above input and output device, and default DirectSound device selected.
make sure Push to Talk Hotkey (PTT Mode) is disabled
Silence Time set to 0.5 seconds
Sensitivity at 30
WINDOWS SETTINGS
Microphone set at 100, boost at 0.0 dB
Enhancements: Immediate Mode enabled, with DC Offset Cancellation enabled.
VoizReal EXP: Noise Suppression and Acoustic Echo Cancellation Enabled.
Boot Arma 3 and feedback should start as soon as main menu loads. Regardless of settings in game.