title: Create an empty blank audio file of a specific duration in AudioKit
body: <p>In my project, I am using <code>AudioKit</code> to play beats. I want to create an empty audio file of the same length of the main beat. and and whatever starting point I choose within the duration of the main beat. it will start recording from that point and will end when the main beat is stopped. override the previously recorded part with the newly recorded file. can I achieve with this an empty audio file at the start. Please guide.</p>