The following audio clips provide sample output from the applications listed on the MAC Skype Podcasting Toolkit webpage.  Note that the Skype host is the caller and the contact being called is denoted as the guest.

Skype with Audacity - LineIn - Soundflower

Observations:
There is a difference in sound level between the host and guest speakers.  The host voice level is much lower than the Skype test call voice (guest).

Skype with Audacity - LineIn - Soundflower and Levelator

Observations:
There is very little difference in sound level between the host and guest speakers.  The host voice level is at the same level as the Skype test call voice (guest).  There is a distinctive "hollow" tin sound generated from the routing applications (LineIn + Soundflower) that can be heard from the host voice.