I play psaltery with a group of dulcimer players. In practice I hear fine but in some of the nursing homes the acoustics are terrible. If I get between the violins and a louder dulcimer I can't hear my own instrument and if one of them is off key I sometimes hear myself as too sharp compared to flat notes. SO.... is there a device I can attach to my instrument with earphones that I can hear my own instrument louder to just me? That would be SO helpful! I can't use my amp so wondering if anyone has suggestions????