Using the Lync mute/unmute hotkey (Win + F4), allows another key to be used for push to talk.
Install AutoHotkey. Note - needs to be a recent version to support the splash image.
Direct link here.
- Install prereqs
- Download and launch script with image in the same directory
- Press Right Alt to push to talk
Microphone designed by Dmitry Baranovskiy from the Noun Project.