Canon EOS Rebel T1i Instruction Manual page 124

Movie Settings
Grid display
With [Grid 1l] or [Grid 2m], you can display grid lines.
Metering timer
You can change how long the AE lock is to be maintained with the
<Z> button.
Sound recording
When the sound recording is set to [On], monaural sound will be
recorded with the built-in microphone. (An external microphone
cannot be used.) The sound recording level will be adjusted
automatically.
Remote control
You can use Remote Controller RC-6/RC-1/RC-5 (sold separately,
p.194) to start and stop the movie shooting. With RC-6/RC-1, set the
timing switch to <2> (2-sec. delay), then press the transmit button. If
the switch is set to <o> (immediate shooting), still photo shooting
will take effect.
Settable Functions During Camera Ready
While the image is displayed on the LCD monitor, press <0> so that
the AF mode, Picture Style, white balance, movie-recording size, and
still image-recording quality can be set.
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Press <0>.
1
The current settable function will be
highlighted in blue.
When <f> is selected, the AF
points will also be displayed.
Select the function and set it.
2
Press the <S> key to select the
function to be set.
The name of the selected function is
displayed at the bottom.
Turn the <6> dial to change the
setting.