Ham Radio Now podcasts are the audio from our television programs (on YouTube.com/HamRadioNow). The shows are all about the hobby/service of Amateur Radio, but there are several types of shows all mixed up among the episodes. Some are talk shows, some are seminars and forums, and there's a mini-documentary now and then. The talk shows make the best audio listening, but you'll get something from almost all of them. We'll rate the "radio" quality in the show descriptions.
http://hamradionow.tv
HRN 257: D-STAR Forum at the 2016 Hamvention®
This is the D-STAR Forum from the 2016 Dayton Hamvention, and a pretty long coda at the end from Gary.
There are some slides, but I think this is a fairly good radio show, especially since it's pretty long.