A strange thing .... my tenor (Yamaha YTS475) will play top E perfectly fine using the three palm keys, but will not play the alternate fingering which according to my book is the top F key plus left hand 2 and 3. It sounds F just fine using both fingerings (3 x palm keys or top F key and left hand #2). Now here’s the strange thing ... I can go down from F to E by closing LH3 and once I’ve sounded F, I can trill between the two. But just play E on it’s own? The horn says no. It just makes a muffled lower Eb sound. Is this usual?