AUDIO COMMUNICATION
iPhone
This is called a smart phone for a reason. With iPhone's digital voice recording called Voice Memo, you can record everything from random ideas popping into your head to your cat's little purring.
The good part is that you can cut through the nonsense rambles of your recording with its editing tool. Just use the trim audio tool to shorten your recording. But beware; all edited files are permanent so you might want to make sure first that you got the right part saved from trimming.
Audacity
Audacity is a cross platform audio recording and editing software. It's definitely free and easy-to-use with its codes readily available for anyone to use or study.