It must be stated -
Mag pups do not pick up the acoustic sound of an acoustic guitar. They never have and never will.
Hence the name magnetic, as in magnet, as in electric flux field generated only by electricity and shaped only by a ferrous metal object cutting across its path, in this case a guitar string.
Nothing about the wood, species or otherwise, can act upon a magnet or the electrical properties of the generated flux field induced by the coil of copper wire it's wrapped with.
However, reducing, or blocking, the sound hole changes the resident resonance of the guitar body, or specifically the air chamber it encloses, such that air resonance (movement out the sound hole) is dampened resulting in the reduction of sound emissions as well as their character. This is a function of the so-named Helmholtz characteristics of the air chamber guitars are basically models of.
But, getting back to mag p'ups, the doping of current models gives them an acoustic modeling feature that can be closely associated with the sound of a cinder block which, if one is so inclined to strap some strings across, attach their mag p'up to and experiment with, he'll find it sounds like a cinder block...no...their guitar...no...wait...the packaging says....duped again.
A modeling circuit gives them a basic acoustic sound output. It's a lashed-up concoction of circuitry that does use a small portion of the sonic characteristics of the specific guitar but most notably all guitars will sound similar. The makers know no human ear can make a (legal) claim to truly hearing one guitar over the other, first, and also know no human ear can expressly state what their guitar sounds like, second.
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