Jack,
Oops! As I say, in response:
* at least on my laptop, the audio was a bit crackling; perhaps you'll want to speak a little farther away from the mike
The audio could have been considerably de-burred, I must admit. The sound cut-outs weren't great, either. I use an internal mike from one port and I'm still experimenting with Vokoscreen, so I shall do some more tinkering when making future videos. * instead of copying-and-pasting the long URL from sourceforge, you can just "wget
http://prdownloads.sourceforge.net/gretl/gretl-1.10.2.tar.xz"; wget should "get" the redirection and work straight away