yup...
a classrom is very hard to get "clean" sound from..
if i where you.. i get a standard pc-mic.. tape it anywhere near the source..
then transfer the recordings.. load it into wavelab.. and clean it up.. then apply the
mic.modeler.. then you can get any mic.. you wan`t.
and if am not way lost.. wavelab also can transfer it directly to MD..
then.. if your idea was to record directly into the MD..
get ditto.. and make a (directional cardboard coate) arond the mic..
and place it in front.. and as close to the source as possible..
(the cardboard is "dead".. so it will make minimum artifacts on the sound..