I just started playing trumpet about 3 or 4 months ago. I have been learning on a Yamaha YTR-8335RG Xeno; a pro trumpet. I have been really struggling making slow progress. My ability to produce a good consistent tone is all over the map. Sometimes its good sometimes its horrible. But here's the thing. I recently started playing with a Bach practice mute with the tuning slide pulled out to bring the trumpet back into tune. Much to my amazement, my playing improved emediately and somewhat dramatically. This phenomanon only seems to work though with the tuning slide out. If I try to play with the mute and slide all the way in I'm horrible. So someone suggested that beginners need the resistance of a student horn that the Xeno simply doesn't provide because it's designed for professionals. Does that sound right? Is my Xeno holding me back?