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I, too, would like Tape Op in pdf form for archiving the great material packed in each issue, but not as a replacement for the hard copy, as my eyes already spend way too much time looking at a computer screen.

I've read threads referring to variable impedance but am just getting into buying a mic and preamp (1st time.)

What does variable impedance mean/what's its purpose?
How important is it?
And are there particular mics that it is necessary for?

Thanks!
Enlighter