Call ins from Spencer aka Free Thrall  from Keep off the Borderlands podcast about aphasia - 

Joe from Hindsightless about maps and minis - 

and Daniel from Bandit's Keep about railroading - 

Links to their podcasts are below - 

Keep off the Borderlands (with Spenser aka FreeThrall) https://anchor.fm/free-thrall - 

Hindsightless (with Joe) https://anchor.fm/joe-richter9  - 

Bandit's Keep (with Daniel) https://anchor.fm/daniel-norton/ - 

Also check out these podcasters participating in OctOSR:  -  

Nerd's RPG VarietyCast (with Jason) https://anchor.fm/jason376  -  

The Redcaps Podcast (with Kevin) https://anchor.fm/theredcaps  -  

Clerics Wear Ringmail (with Taylor) https://anchor.fm/clerics-wear-ringmail  -  

Down in a Heap (with Rob) https://anchor.fm/rob-c  -  

Dekahedron https://anchor.fm/jpgill - 

Minions and Musings https://anchor.fm/eviljeff - 

Red Dice Diaries https://anchor.fm/the-red-dice-diaries - 

Confessions of a Wee Tim'rous Bushi https://anchor.fm/menion - 

Shadow of the GM https://anchor.fm/gmsshadow -