Canon EOS 600D - Manual (Page 216)

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Set [Set up] as desired.
Press the < V> key to select [Set
up], then press < 0>.
Set the [Display time] (still photos),
[Repeat], [Transition effect], and
[Background music].
The background music selection
procedure is explained on the next
page.
After selecting the settings, press the
<M> button.
[ Display time ] [ Repeat ]
[ Transition effect ] [Background music]