I got my package of fun today, writed up the goodies and switched it on. I tested it with just a 9v, worked fine. Then hooked up my 8 AAA, also worked fine, but I heared this wine coming from the inverter. Turned off the music, and yep, is there with the 9v, but very soft. So my question is, Is this normal? And what can I do to hush it up a bit? I know once its in the hilt it will be softer, and I am not sure if it would be safe to wrap it in like packing foam or anything. Ideas?