Quote Originally Posted by jwlowry View Post
I own a set of Ross Electronic pipes. Very nice to practice with, not so great for plugging into an amplifier (I get feedback, which I frequently notice when I use it with headphones as well).
Sounds like there may be a problem with the amplifier in the unit. You might want to check with the manufacturer, as without a mic-speaker combination, unless the anti-oscillation feedback loop has gone bad (usually a high value resistor) or a design problem, an electronic amplifier won't self-oscillate (feedback sound)