You can merge two TouchCasts by going to "My TouchCasts," selecting the edit pencil in the lower left corner and tapping to on highlight in green the two TouchCasts that you'd like to bring together. You then can then arrange them in the any order that you'd like. This will create a new TouchCast all together, so you are not losing your individual TouchCasts. Note that your TouchCasts cannot be over 5 minutes combined.
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