Heya! I'm actually that Josh guy from Cthulhu & Friends. Thanks for the shoutout.
The sound quality issues in the first few episodes got better as the show progressed and as we got more proficient at producing the thing, but starting on episode 19, we will no longer be using audio recorded from the Hangout sessions to create the podcast, so that should fix up that problem completely. We're using professional gear and what have you. Huzzah. Also, the version that we play is D20, but it's sort of a frankenstein system we put together using bits of DnD 3.5 and AD&D. We veered from the Wizards released CoC rulebook after a few episodes. Fun fact.
I also wanted to suggest you guys listen to Drunks & Dragons over at DnDPodcast.com or GeeklyInc.com. They started out with the same audio issues, but eventually got their shit together and have a pretty damn good show, despite it being 4e.
Also, if you're hungry for more Call of Cthulhu action, there's Miskatonic University Podcast, where they play the original Chaosium rules. They go over sort of the whole RP experience, from character creation, to GM tips, and then Actual Play. Personally, it's not my cup of tea but they gave my podcast a shoutout, and I figure I should return the favor. They're at mu-podcast.com