[vegetablepotpie]

I doubt that storing digital representations of sounds on the cores and then stroking the cores would result in any modification of the data. You could run a wire with current next to the cores to induce bit flips, but what happens to the sound would depend on the format of the data stored on them.

You could put an inductor in or around the array, which could pick up magnetic impulses from currents used to program the cores. If you amplify the voltage coming out of the inductor and sample that, it could result in interesting random sounds.