I've heard a few folks talk about this one:
SOURCE-TALKBACK 1.2 FOR AAX WITH AUTO MODE
Enable console style talkback and listen-back without needing any external hardware. Newly designed for AAX 64-bit compatibility in Pro Tools 11. Now with Auto mode.
A. Talkback (Aux) goes on the Auxilary track that has your microphone input.
B. Talkback (Master) goes on your Master fader.
To open and close Talkback you have options:
1. Click the Talkback button to toggle
2. Toggle using then slash key "\". Latch using Shift+\.
3. Enable Auto-Mode in the Options menu. Talkback will close when the transport is running and open when stopped.