**If you're on a phone you'll need headphones! I used a sine wave for this without thinking about phone users. I know for next time!
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So I had a few messages asking me to cover this in more detail - here's what I could rustle up before work! I really want to try and do at least one video like this per week, based on your suggestions. So just comment what you'd like to see. I want to keep them short but in this instance I don't think there was a way to cover QNG "quickly"!
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Thanks for watching!