Hi, I'm new to the forum. I'm a full-time church musician, and we have a number of digital and acoustic pianos on site at the church. One of them is a Casio PX 110. It powers on but there is no on-board audio. It *does* play through an amp via the headphone jack. I checked and the local midi control is as it should be. (If it was wrong it wouldn't play through headphones either - I checked.) Any ideas? Thanks!