Lexicon 12T User Manual page 75

To stop writing automation events, click the Write button a second time, or close the Mixer
window. All changes to this track and its plug-ins will cease to record.
To play back automation in your mix:
1. Check that the Audiomix Track or Part is not muted.
2. Activate automated playback by clicking on the Read button in the upper
left corner of the Monitor window.
If you want to watch and listen to your recorded mixer actions, for example,
while you're recording fader movements for another mixer channel, you can
activate Read and Write simultaneously.
Begin playback as usual. The monitor faders and controls will move automatically, following your
recorded actions. You will also hear your plug-in automation events playing back with your audio.
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