Well let me explain with a video …
The other reason is explained at http://three.sentenc.es/
Software Links:
Text Expander [Mac] – http://smilesoftware.com/TextExpander/
Phrase Express [PC] – http://www.phraseexpress.com/
Texter [PC] – http://lifehacker.com/238306/lifehacker-code-texter-windows
QuickTime Player [MAC + PC] – http://www.apple.com/quicktime/download/
How to do this on different iOS devices:
iPhone / iPad using standard memo recorder and mail app – https://henryreith.co/how-you-can-send-audio-emails-on-your-iphone-basic-setup/
Credit:
I do not take credit for this idea, i have the entrepreneur and productivity king Pete Williams to thank for inspiring me to create audio replies and help me use my time efficiently.