> There are a few other considerations if you want to use this for
> broadcast audio. Essentially you have a conflict between loop settling
> time and audio quality.

Yes, of course.....but I was giving the abridged version!

The usual trick is to modulate both the Control Voltage (for higher freq
audio) and also the Reference Oscillator (for lower freqs).

BTW, you CAN just modulate the loop, if you are using a Frequency
Comparator, and you just let the phase lock be broken by the bass
frequencies....

In otherwords it becomes a Frequency Locked Loop, rather than a PLL..

............................ Zim