watch a video on the basic controls in cygnet (1:34)
Press the Play / Pause button to begin a session and press again to pause a session.
Raw EEG signal, spectral display activity & inhibit bar activity will appear when a session is playing.

The source indicator light indicates the selected source (pictured below)
Live Session
Session Replay
Simulation
To stop a session press the Stop button 
This will also reset the session timer back to 00:00:00