The mighty Crate GFX50 Student Model!! Twin inputs! Twin headphone jacks! Stereo CD input that plays in mono through its one 12 inch speaker?! Or at least it would have if Crate had finished soldering the pins on the power amp transistor. Depending on which way you shake the amp you get either stunning silence or a jet engine roar. You can't teach your students the solo from "Crazy Train" note for note if your amp was left halfway built at the factory.