Yes! This a new feature in Reflector 3. 


There are two ways to begin and end a voice-over recording. 


You can select the microphone icon in your Reflector 3 menu. The drop down arrow beside this icon will let you choose which microphone you will record from. This must be a microphone that is attached to your computer.



You can use also use key commands to begin and end a voice-over. 


Press Command + Shift + V to begin or end recording voice-over audio.