He smiled softly, before nodding. "Good question. When I first got it to work, it was the difference between being able to cast ghost sound with the noise of a dozen people, and then adding one more person to it. I probably went through several dozen wands just proving it was possible. Actually getting the wand to amplify thanks to my magic took years accomplish."<br/><br/>He first had her cast a few spells, learning what kind of caster she was, before actually getting to the part of the lesson she wanted.