[sdiy] Why is Linear FM usually (always?) AC Coupled?

[Pete Hartman]

I was just discussing this with a friend, and his speculation was that it
would prevent any DC component from shifting the center of the modulation
away from the note that was being played.  And while that seems plausible,
I've never heard anyone explicitly say that was why.  To be fair I don't
think I've heard anyone explain why.

So: is there a reason linear FM inputs are typically AC coupled?  Have we
stumbled on the right answer?

And if so, why would Exponential FM be left DC coupled?  So you could
transpose?

Thanks

Pete
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