Thank you Bill and Greg for your masterclass in how this sight works. Invaluable to us all.
It has reinforced my recent thoughts re purity of process. Having dipped into Emerald after some reasonable responses in Ruby I have gone through all the course from the beginning yet again in the last few weeks and have reached Andante A. Each time I go back it is more demanding to get the initial exercises absolutely perfect as the magnifying glass shows more detail. It is a long road but each time I go back I feel the general improvement in my playing and I do many more repetitions of Largo to warm up after 5 minutes on trombone. I then do whatever status I have reached. I hope to get back to Ruby and beyond but without compromise.