-Share a link to their whitepaper or website
-Audio quality is unfortunately horrible, people are spoiled :(
-Although your voice and talking is great. The guest was very hard to follow from the start. Make him give more of a summary. Start with generalizations.

So basically:

Build up the complexity of the subject over time, guide your guests more into certain topics. Never ask: "Can you tell us something about Codum? " It's way too broad.

Hope that helps