Saw this app linked on this Italian podcasting how to article, via Podcasters.org article about how to record Skype on OS X.
Soundflower is a MacOS X (10.2 and later) system extension that allows applications to pass audio to other applications. Soundflower is easy to use, it simply presents itself as an audio device, allowing any audio application to send and receive audio with no other support needed. Soundflower is free and open-source.
Link to share this: https://gabrielserafini.com/blog/2004/10/21/cycling-74-soundflower/