Recording With The Built-In Microphone - Canon Rebel T2i Quick Start Manual

Recording with the Built-in Microphone

The built-in microphone is on top of the recorder.
It records in stereo with two directional microphones in a XY pattern.
You can adjust the width of the stereo recording from 90 to 120 degrees.
120 degrees will pick up audio from a wider area. The recording will feel
more spacious. For a recording of a single person in front of a camera,
choose the 90 degree width.
The recording level is adjusted below the XY microphone.
Enable the L and R buttons on the recorder. Press the R button while still
pressing the L button. On the screen, the XY channel will turn red, indicating
that it is ready to record. Now you can monitor your signal to see if it is loud
enough.