Back on April 8 I posted on Trumpetmaster with the same title I am using now. At that time I had been trying to build up my chops for around three months & still had what I called a "sick cat" tone. I orginally had a great clear tone. Reading my April post will explain what happened orginially. Anyway, I have continued with my daily practicing which consists of an hour to an hour and a half each day. Two people posted an explanation back in April as to what probably caused my problem, their user names were Gmonady & TrumpetMD & I believe they are doctors. They both agreed that I had developed a "split tone" by overdoing it in a gig I played after laying off playing for several years. At this time my chops are strong enough to allow me to practice the hour or so each day in 30 minute intervals but I still have the "sick cat" or "split tone", maybe not as much as originally but still sounds out of tune to a certain degree. I believe it was Gmonady who wanted me to reply as to how things were going so I wanted to oblige.