Make your voice recording sound like a ROBOT VOICE
Record your speaking voice directly into Audacity.
Select the waveform, by clicking on the word 'mono' on the left.
Go to 'Effects' - 'Delay effects' and type in some numbers, as follows:
Decay amount: 10
Delay time: 0.009
Number of echoes: 30
Then go back to 'Effects' and click 5 times on 'Repeat delay'. Now
you have a robot voice!
To use this in Photo Story, export it as a wav with an appropriate name.
You could apply this effect to other sounds too. Explore
other effects and remember them for later use.