Sure, you may be a big fan of All Things Considered — but have you considered getting audio advice from pro NPR and PRI vets?
That’s exactly the idea behind the superb site Transom, which brings in public radio experts and celebrities to talk about sound, radio production, and how you can create your own radio content — putting the public in public radio.
And where better to start but with a practical tutorial for the cross-platform Mac/Linux/Windows audio editor Audacity:
This is the best Audacity tutorial I’ve seen yet (though feel free to suggest others), complete with workarounds for some of what Audacity lacks, like metering. What? You’re not yet using Audacity? This is the current best freeware / open source gem for audio, perfect for basic multitrack and stereo/mono editing.