SpokenMagic

this app can change voice to man,woman,baby,old man,even bird and pig
also it can control the speed of speech

Press and hold the microphone
icon to start recording,
once release, will play

Adjust the slider to change the
speed of voice playback
# - up pitch
b - down pitch

Select bottom of the character
patterns can change the voice
voice file save & load
You can also send voice to friend by Line