I can well appreciate (more so today than yesterday) that having two persons in one room sharing one microphone into an mp3 recorder has 'technological' advantages.
As for me, I live in the mountains, and I decided to test out interviewing at a distance using the Google Chat feature of Google Talk, on my Mac(s). The interviewee was 1000 km away. I sent an email with my invitation, schedule proposal and a couple of documents about wikis, as pre-interview reading material. The analogue voice output from my interviewee through Mac speakers was however much quieter than my voice into the microphone here. How to edit an mp3 file to adjust alternate voice loudness volumes ?
GarageBand music application can not open up mp3 to adjust the loudness of only one segment, but iMovie can using the recording head to make a break in the timeline.
Therefore I transferred the GarageBand mp3 to iMovie, adjusted the loudnesses, reverted back to Garageband deleting the unused video-track and then shared the mp3 to iTunes, from where I could click and drag the soundtrack as .aif file to Switch (a sound file converter application) and get an mp3 with correctly adjusted volume levels now.
For some reason StudioOdeo does not accept recording new audio into an old Podcast channel, so I uploaded the mp3 to my website Open-Ed-Podcasting.net and then linked StudioOdeo to the file there, for publishing as a podcast, and accessing via iTunes. The technological schema is given here
I will detail the actual podcasts in the following Post.
All Best Wishes