Trial version of this best voice changer app allows saving the first 30 seconds of your call to WAV. Using it you can play pre-recorded sounds effects for the other person to hear.
To use this voice changer app, you need to install it on the capture device you want to modify. It needs to be installed as an add-on to the app with microphone access.
This voice changing app lets you change voice for Hangouts, Ventrilo, Discord, Skype, Steam, etc. Also Read: Cool And Harmless WhatsApp Pranks 2.