Have you tried to the volume multiplier (Auto Volume Adjust) on Hijack. I know it works great for mp3's and keeping them equal volume, no idea if it works for radio.

Yes I've used voladj... It doesn't work on the tuner, only on the MP3 source. Furthermore, voladj does dynamic compression, which is not the same as changing the volume for a source. I *want* the quiet parts of a song to be quiet, and the loud ones loud. But this problem is where the relative volumes of each of the tuner bands are way off... So if an AM station, an FM station, and my Empeg's MP3 source were all playing the same song at the exact same time, and I switched between the three sources, the AM would be MUCH louder than the MP3, which would be louder than the FM.

The easiest example of this is to switch between an FM and an AM station. Unless there's something quirky about my setup, you should notice that for a split second after you switch to the AM station, the volume of the FM signal shoots up higher. Then when the AM signal kicks in, it's very loud. If the two stations were playing the same source material (sending them at the same volume of course) the AM would sound much louder.

So even if voladj worked on the tuner signal, it wouldn't be the right way to fix this.