Voice changer. Create robot ringtones with nöid vöice! 14 different voice effects. You can also change pitch and speed of your voice!
Either record your own voice, or use your built in TTS engine to generate a voice. If using TTS, The Pico engine is not very high quality so the Ivona Voice engine is highly recommended, available for free on google play. Specifically, British voice Amy. Svox classic and Acapela are other recommended TTS engines to use.
The optimum setting for recording is 22050Hz.